Fantasyland has most of the rides for the younger kids. This section of the park stays crowded (very crowded) all day until I would say after dinner hour. Get there at park opening (EMH if you are on site!). Ride Peter Pan and Dumbo first as those get the longest lines later. (Peter Pan gets up to a 120 min standby at times!!). Fast pass Peter Pan to ride again later (it seems to be a fav.) Then there's the winnie the pooh ride, snow white scary adventures, small world, Philharmagic "movie" attraction, tea pots, the grotto for Ariel is there is you want her autograph. I think these are the attractions w/ FP in this area: Peter Pan, Snow White, Winnie the Pooh, Philharmagic.
You can then go to Mickey's Toon Town. They have character greetings, a small coaster, face painting. Then head over to tomorrow land. Buzzlightyear, the blue line ride, speedway racers, space mtn is over here if you want to ride it.
Then go to the other side of the park (can't remember the name) they have the jungle cruise, swiss family tree house play area, aladdins magic carpets, tiki room, pirates of carribean. At frontierland they have splash mtn, big thunder mtn railroad (a 2.5 yo is probably too short for these) and the country bear jamboree!!