How about up in a tree? I always wanted a treehouse when I was a kid. Maybe I'll finally have one for my grandchildren to enjoy! The Pallet Project: Tree Hut, from pallets and skip treasure.
10 Creative Ways To Reuse Old Tires Inner-tube seat
DIY Sand Box Using Wooden Pallets - Find Fun Art Projects to Do at Home and Arts and Crafts Ideas. A sandbox with a lid to keep the animals out!