My son (18 months old) could be content for hours with a bat and ball. He always liked to make sounds/music, too. He has maracas, a farm animal guitar, tambourine, and a toy piano. We have a blast pretending to be in a band together. He recently began an interest in trains, trucks and cars. He finally mastered the rocking horse that my folks got him months ago. Books continue to be a favorite, but he's starting to put books and little toys in my purses while carrying them around. Oh, adding to his "outfit" are my shoes.
We are starting to push him toward the blocks lately since he doesn't know how to stack them (fine motor). We talk about the colors and which ones are big, little, etc. We also realized that we don't allow him to use crayons and markers as much as he should.
He is not very interested in puzzles or sorting toys unless I initiate and role model the play. He would usually put the puzzle pieces on shelves and tables instead of in their place.
During this summer, we explore outside A LOT. He is playing with sticks, pinecones, grass, butterflies, leaves, flowers, caterpillars, dirt, sand, ants, rocks, EVERYTHING. It's been an awesome experience so far!