A lot of the low buy-in tournaments are going to have pretty bad structures forcing there to be a lot more luck when you get down to two tables.
Atlantic City Poker Guide - A Guide To Atlantic City Poker - Home
Check this site out, and click on tournament schedule to see if anything catches your eye.
I would say the best value would be the Borgata tournaments/sng's although they are a little more expensive. I would either stick with 1/2 NLHE or a SNG if you plan on playing elsewhere.
I frequent the Tropicana since my friends and I have a shore house in Sea Isle City (about 25 minutes away) and find the play to be pretty beatable if you find the right table. If you don't like the table you are at simply ask to be sat at a different one, they are usually pretty cool with it.
The Taj has a decent mix of players but the chips are so damn dirty!!!! Nasty honestly.
The other one I go to sometimes is the Borgata. It's easy to get a lot of drinks there and have a good time in a really really big poker room for A.C.
Just know its going to be a younger crowd and a bunch of young bucks that think they are on TV or for some reason or another try to act like Daniel Negreanu.