Bloomington lake! It's just north of Bear Lake, about a 2 1/2 hour drive. We decided (sort of last-minute) to spend the night up there so that we could play at the lake all day. We got there at 11 o'clock that night and were gone by 2 o'clock the next afternoon. It was quick and definitely worth it!
There was a ROPE SWING! But the water was so cold, there was a glacier sitting right on the edge of the lake. We also went cliff jumping, but since I'm scared of it I only jumped once. Daniel on the other hand, scared the hell out of me.... Here's a video
I don't think I would have said this before I met Daniel, but sometimes those short, spontaneous trips are the most fun. We had a blast!