Real fun begins at the end of your comfort zone so have a Yes Day - or even better a Yes Week.
Much of what is so much fun about Burning Man is doing things outside your comfort zone so try to do things that you would not normally do.
Pick a day and say yes to everything on that day. Keep it to yourself as you don't want people to take advantage of your yes day.
I tried this in 2013 and liked it so much I made it a yes week. The only thing I said no to was food that I knew would make me sick (allergies).