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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.

Let The Children Play has a nice post on creating labyrinths in children's play areas. You'll find lots of pictures and links for inspiration to make your own.

Kalamazoo Outdoor Gourmet kitchen in the Hamptons

Beach-inspired pool.

Drill holes into your fence and replace them with marbles. 32 other backyard ideas.

Great wood pattern in the construction of this backyard deck

Beautiful outdoor kitchen!

Party shed in the backyard! this is even better than the guest house I pinned earlier this week.

Cool Fire Pits (15 Pics)

very small and simple gold fish pond. Perfect size for a very small space.