Summer is blazing here in eastern Pennsylvania. Kids are playing outside, trees are done blossoming and offer wonderful shade, and it stays dark late. These are elements calling you to build a tree house (or fort if you prefer) with your kids.
Tree houses offer kids of every age a place to retreat and be themselves. Tree forts fuel the imagination whether of battles like the knights of old or mystery solvers like the Hardy boys. It's a place to read the Hardy Boys books or Little House series of books. Tree houses are simply cool (or is it sick?)!
A tree house could be built simply as a platform with railings for safety, or complete with windows and a roof. Consider buying some of your supplies inexpensively at the stores associated with Habitat for Humanity ReStores. http://www.habitat.org/env/restores.aspx
R & R (rest and rejuvenation) are the intentions behind the Friday @ Five entries. Often these are inexpensive and low key because you recharging your batteries can be more easily achieved without running around and doing, doing, doing. Many Friday @ Five entries are geared to do with your family or friends.