We usually put in at the Whittaker Pond launch. As with all caches in the area, bring scissors in case the blackberries have gone crazy.
Level 5 for terrain because special equipment is required (a kayak), but once you are paddling, the difficulty is only about a 2, depending on how much gunk or logs you paddle through. Water levels vary, but you can get to this cache, find it and replace it without getting out of your yak