Dorney Park Game plan: If you intend to be there at open, go straight to the bottom of the park (read: the back). While I don't know how Stinger is going to impact this, Steel Force is ALWAYS dead for the first ten minutes at least. You will want to start back there and work your way to the top of the park, maybe even getting some of the water rides before it gets too hot. Thunder Canyon is really unique and extremely drenching, and Thunder Creek Mountain is cool both for its views of Hydra and its unique setting. Talon dies out within 30 minutes of the waterpark opening but always has a line once the gates open. If you intend to go into Wildwater Kingdom, do so as soon as it opens, and then avoid it for the rest of the day. The majority of guests will flock there within an hour of it opening and the lines will increase exponentially.
If Possessed is down, expect lines at Steel Force and vice-versa. Steel Force tends to be empty for most of the day until about 20 minutes after the waterpark closes. Talon, I told you about already. Sometimes it picks up around lunchtime, but it depends on the heat. Then it can get busy during the hour surrounding the waterpark closing, and tends to calm down significantly again after that.
I've never worked on Hydra, but I also haven't seen it have a line in years. Thunderhawk gets a line around the same time Steel Force does, it just takes longer to disperse because Thunderhawk runs one train unless its a busy weekend day. All the rides in the park should be a walk on throughout the day. Most of the school/camp trips leave at 6, giving you about two hours before the park closes to do whatever you want. Unless you go in early June, it shouldn't even be dark by that point. Keep in mind that Fridays can be just as bad as Saturdays, but the park IS open later and will be dead towards the end of the night.
Riding: If you do get an oppurtunity to ride at night, all of the major coasters are fun. Even Hydra is admittedly better at night.
Where to ride: I believe the back is the best on
Hydra, but Hydra has a nice rattle going, so you might want to ride the front first to get accustomed.
Talon, either the front row seat closest to the exit, or the back row furthest from the exit. Both are completely different rides, but excellent.
Steel Force... for the longest time I was a huge proponent of the back seat, but the front offers slightly more aggressive air time, and I've had debates about the quality of the third row. Black train is fastest (not by much, but it still is), and the red train is smoothest. The blue train just kind of sucks.
Possessed is a matter of personal opinion. I love the back because I don't care for the twisting in the front and enjoy the longer freefall. It is cool seeing how close you fly to the end of the track in the front, though.
Thunderhawk: The front seat. Do not ride any other row. Just the front. And loosen your seatbelt a little 'cause it'll dig in, as well as bracing yourself. Be careful not to loosen it conspicuously on the lift hill as they watch the lift hill, if they're actually doing what they're supposed to.
Otherwise, as I said, I recommend the dryside water rides. Revolution is fun if you like being dizzy, as is Monster. Apollo, Hangtime, and Meteor are personal favorites of mine. And the Ferris Wheel is a prime photography location, just put your camera away on the way through the station.
Food: Whenever I was a guest at the park, I always ate at Burger Barn and got just a large fry until I later realized I could get Just Tacos for relatively cheap. Also, the prices have increased by at least $1 since that time period. Honestly, though, the only noteworthy food in the park is Chickie's & Pete's, which have some amazing crab fries, from what I've heard. Otherwise, there's a pizza shop in the plaza next to Dorney (not across the street, but if you go towards Allentown, away from 78, it is literally right next door). They have really good food, in my opinion, for non-inflated prices. For the life of me, I can't remember what it's called. Maybe Frank's? I recommend the pepperoni stromboli, but that's just me.
Obviously, if you let me know when you're going to the park, I would definitely love to go ride with you!
Six Flags Great Adventure By no means am I an expert, but I can tell you one thing: This park is big and typically busy. Spending two days there was a wise choice on your part. I mean, it is definitely possible to do everything in one day, but if there is one place to avoid going to on a Saturday, it IS Great Adventure.
Game Plan: Avoid Superman until later in the day unless you're there at open and you're in the front. In that case, though, I'd go to Green Lantern first. Everybody typically runs to Kingda Ka, El Toro and probably GL now, too, so if you go to Nitro first, I think you should be safe. Keep an ear out for rumors of the lines in the popular part of the park (Ka/Toro). Nothing in Movie Town should have a line for most of the day unless they're running one train on Nitro (happened to me on Easter last year!). The park is so big, though, that you could play it by ear. I'm not sure if school kids get there for opening, because I know they don't always at Dorney. If it's flooded, again, go to Movie Town, then I'd say work your way over to Bizarro, and then up towards the front via Toro, then Ka, then S:UF & GL.
Food: I've only ever eaten at two places: There's a KFC-like place on the way to Movie Town by the Ferris Wheel which wasn't horrible, and a Spanish themed place right in front of El Toro. I can't remember whether we had the Nacho Supreme or the Taco Salad, but it was HUGE. My mom and I split it. Otherwise, there's a handful of food places on the way in that we typically stop at before making the smallish trek home.
Riding: Usual B&M Hyper seats for Nitro: Front & Back. Try to keep that clam shell loose.

Toro is incredible in the back, but the front is also worth the wait. Hold on for dear life. Try not to sit in the back of the car on Ka: She's developed a pretty bad vibration that's sure to hurt. I couldn't tell you much else though. Nitro at dusk or night is fantastic, though.
Kings Dominion I would say I know more about KD than SFGAdv, so I hope this helps.
This year was the first year that I did a solely KD trip, and I have to tell you, it gets boring if you're there for the whole day. I've gone August weekday, April & May weekend and June weekday, and until this year, I always did it in combination with SFA (which really isn't that horrible). The worst line is always Volcano. Longest I've waited is 45 minutes. Even so, it's pretty easy.
Game Plan: Everybody (EVERYBODY) either dashes off to Dominator or Volcano/Intimidator first. Usually the latter. Nobody drifting towards Dominator? Why not ride it. If you go back behind the Eiffel Tower and go to Grizzly first, you should be fine. Grizzly, Hurler, Ricochet, Rebel Yell, and Shockwave. If you see a line on Shockwave, just pass it. You can go back later, and a 4 or 5 train wait is at least a half an hour. Then, Anaconda, FoF, and Italian Job (I can't remember its generic name). Avalanche doesn't open til noon most days anymore, I think. By this point, you should be extremely, extremely anxious for the best two rides, plus the lines shouldn't be bad. Check Volcano. Is the line bad? Keep in mind that it's about 10-15 minutes if you see people poking out of the mountain upstairs. If it is, just go to Intimidator. It eats people and you can always go back to Volcano. I highly recommend KD's Crypt. El Dorado is a blast, too.
Riding: Flight of Fear is best in the front, but I'm sure you know that already. Volcano...is, like most coasters, completely different in the front and the back. The front is more than worth the wait, especially at night. Intimidator has slightly more whip in the back than in the front, but again, both are worth the wait. Otherwise, I still haven't figured out how to ride Anaconda properly and I'm convinced there is no way to ride Shockwave well. Grizzly... the front. I always rode middle and back until last fall and WOW. Spectacular in the front. Rebel Yell is fun no matter what, but compare to Racer.

And Hurler...oh, Hurler. Ride the front of the car for best results, but the front is also highly recommended.
Food: I really have nothing to offer here. My friends and I usually just eat at Denny's, BK, or Seven-Eleven