A.
I usually buy some games (board games) or cards.. or in the summer - beach toys from the dollar store. Currently Target has a lot of games for just $4.. but its only for a couple of days.. so check it out quick. Makes for some good favors. Other things you could do is toothbrush/toothpaste kits or bath stuff.. like bath colors or bubble bath.
Good luck,
Aarti.