Personally I spend as much time inside the venue as possible, if I'm at camp I'm probably asleep, resting, or snacking.

We bought one of these in 2015 and its still holding up strong: https://www.amazon.com/Grand-Trunk-Parasheet-Picnic-Blanket/dp/B001AIFGGE/ref=sr_1_3?ie=UTF8&qid=1496330555&sr=8-3