DIY your own splash pad. // 32 Cheap And Easy Backyard Ideas That Are Borderline Genius
Bouncing bubbles...bubbles that don't pop! Just like the Gymboree ones! Yay I've been looking for this recipe Great Bubble DIY for Kids – Make Bubbles that Will Bounce
Flubber...15 Awesome Kid's Crafts for the Summer
Letting kids LIVE - seriously an awesome list of 200 easy things for kids. ages 1-5
I love this idea for the kids stuffed animals
Make sandbox. You could use pallets for this, but you'll need to make sure they are well planed and de-nailed.
7 Popular DIY Tutorials | product design | tutorials product design diy
@Holly Babcock awesome book with lots of cute ideas
Build A Barbie Doll House Out Of Old Dresser. Love the drawer to store everything.
make a Lego marble maze - this could be as simple or elaborate as your child wants