Unless I'm planning to be in the woods for more than a three day weekend, I generally prefer these to a local stream or lake. While not as relaxing as a hot shower at home, it beats jumping into an ice cold stream and then having to walk back through the sand/mud/whatever to towel off.

During the colder months I simply place the package next to the campfire for a few minutes to warm them up -- reminds me somewhat of the hot towels the flight attendants provide before a meal in First Class.

Jim