If you plan to hide caches in 5 gal. buckets I recommend putting some kind of camo on them to keep them from being discovered accidentally.

Also, start geocaching if you don't already. It's great practice for finding things in the bush using a GPS. Remember that even the best GPS might not be able to pin point it...only get you within 10 to 15 feet. I guarantee you won't remember how you placed all of them when it comes time to actually need them. Changes in terrain, weather, lighting, etc. make a huge difference.