My youngest is almost 4 but he still likes to take those big checkers and put them in old wipe boxes, dump them out and start over :) For his 2nd b-day he got a tricycle and a little people airplane, for his 3rd dh built him a sandbox Duplos(they have girly ones if that's important to you), books, puzzles, outdoor toys. I like paints, rolls of tape, other simple crafty stuff to introduce at this age too.