Giant sensory bag "water bed." This is the best outside toy ever! Under $10 for a whole day of outside fun.
Mudjacking is a way to raise sinking concrete driveways, sidewalks or concrete slabs (like a patio) back up to where they should be.
Top 23 Surprisingly Amazing DIY Pallet Furniture For The Kids
Build a structure where the kids would never want to come in! Combo Playhouse, Covered Play Structure and Sand Pit/Outdoor Toy Storage. Swings could be added. Built by Cubby Kraft, photo features Sandalwood Lodge Cubby House. Link leads to 50+ playhouse/structure examples.