A site, with respect to its environment.
Location is everything.
Well, location is important anyway. Choosing the right location could be rated up there as one of the most important decisions you'll make in the planning of this family reunion. You can choose a location, if you wish, once you know what type of reunion you want, the desired dates, and have a fundamental idea how many people will be attending. But for larger reunions, you may want to consider a park, campground, a nice resort, or maybe even a theme park. Mister Spiffy votes for a theme park.