My mistake is about 10x10 and only serves as an occasional fishing platform.
Not only do the bungs seem to finally crack and leak but people seem to prefer sitting at a table or in a smaller, more face to face grouping. And, unless they are fishing or swimming, adults will pick a shady spot every time. On the other hand, children... well, no sane person would try to predict what boys will do, but it'll probably be somewhere between totally unacceptable and just plain dumb. Girls seem to be much less adventurous.