I remember coming across an old fire lookout tower on a hike with a friend when I was younger. It was about 80 feet tall, and well past its structural prime. My friend had been there before and took great joy in running back and forth while we were up top, rocking the whole thing and terrifying me.
Despite that introduction, I've always been interested in fire lookouts. Here is a map of rent-able lookout towers - information provided courtesy of http://firelookout.org
Boise, Idaho may not be on anybody's list for top scuba vacation spots, but there is diving here. Some diving is better than no diving. Lucky Peak Lake is just a few miles out of town and it offers some fun diving options