Outdoor chalk board: Birch plywood, primed on both sides then coat one side with chalkboard paint un-sanded grout + 1 quart any color paint}. Hang on fence with galvanized wood screws. AWESOME outdoor fun for the kids!
DIY Water Table with Water Toys - Plastic Pool on Plastic Crates. I'd probably do ours in green or blue. This also looks like the more feasible diy water table option for me, as I'd have to borrow tools to make any of the other tables!