Exactly what you're picturing is spot on. It's really cold because it is from the snow melting in the mountains behind the dunes. Thats why its only in that window that you can tube.
I've been to it, accidentally. Saw a couple Unimogs, a lot of Defenders, saw some LCs too. Coffee and solid axles is what you get. Is that not satisfying enough to spend an hour of your day?