Hand 1: Fold. It's possible he didn't get his flush draw and he's trying to steal the pot, but I would think he'd bet bigger in that situation. He possibly made 2 pair, but the straight is a definate concern. Just too many opportunities for him to have a better hand.

Hand 2: Fold. This guy is very confident in something. He wants callers with the $2 raise. He thinks you may call the all-in. I'm expecting trips.

Hand 3: If you think you can execute a bluff, raise. I'm expecting SB to have a Q, the bet's not too big. You may be able to bluff them out by raising and representing trip 2s. (you said SB was very fishy)

hand 4: Fold. This hand screams out that UTG had a 6.