Back in the day, a front or back yard tree, with just the right branch configuration, use to make a perfect tree-house to play in with the addition of some boards and a sheet or two. Nowadays, with all the various toddler backyard playsets around, you can purchase, and safely set up, a play house that will have your toddlers climbing, crawling and sliding safely.
Toddler Backyard Playsets:
Toddler Backyard Playset pictured: Little Tikes Rock Climber & Slide
Toddler Backyard Playsets example. Pictured: Step2 Play Up Double Slide Climber