D.K.
CHILDREN'S MUSEUIM!!! They just started a BOB the BUILDER exhibit, too. Lots of dinosaurs and other fun things to see and do! I LOVE that place!!
How about creating some things/projects of your own....making your own play dough, starting flowers, plants or herbs from a seed (right now is the time to start them), etc.
There are also PLENTY of books out there that have LOADS of projects for kids! Don't forget to make time to work on letters, numbers, counting, etc. There are lots of creative things you can do with those skills.