When my DD was that age, she loved dress up! She still does (she is 4 now). She also loves her kitchen, babies, books and art. Oh, and she is also playing with her dollhouse now. My DS is 2 1/2 and he really enjoys cars/trucks, carrying little things around in his hands, and deconstructing anything he can get his hands on. Dumping and pouring are also very satisfying at the toddler age.