We went last August when our oldest son was 3, and here are his favorites:
Magic Kingdom: Goofy's Barnstormer, Pirates of the Caribbean, Buzz Lightyear ride, Dumbo, Small World
Epcot: Soarin', Nemo Ride, Talking with Crush
DHS: Toy Story Mania, Star Tours, The Little Mermaid Show
Animal Kingdom: The Lion King show!!!, Kilimanjaro Safari Ride
Character Dining: O'Hana breakfast with Lilo, Stitch, Mickey, and Pluto
Crystal Palace with Pooh, Eeyore, Tigger, and Piglet
Hollywood & Vine with Jojo, Goliath, Leo, and June
Other Dining: Tony's Town Square in Magic Kingdom, Hoop de Doo at Fort Wilderness
My son's absolute favorite meal was Hoop De Doo. He still sings songs from it almost a year later.
You are going to have a blast with your boys. As a mom of 2 princes, I wish there were a couple boy oriented character meals like the Cinderella ones, but maybe there are some in the works.