Garden retreat - cute idea; I'd like something elevated in the back corner of the yard that overlooks the river behind and the pool below with maybe a swing elemenent - bed, chair, hammock . . .
Pirate ship playhouse
How to make a tree house for under $300. Build your own outdoor playhouse. - www.madewithHAPPY.com
Backyard tent / treehouse - This is going to be outside my house.