I've done Gun Beach 7 times so far. Snorkeling only. I am an experienced diver though I don't feel the need in this spot. Gun Beach is super easy and chocked full of life. It's just like what has been said with a few changes. If you follow the pipes out, you can go either way. If you go right you must go out until you are parallel with the private beach. You will find the place swarming with life. From cool corals of almost every color to fish trying to chase you off. If you go left you find a series of nice holes in the reef, leading to all sorts of cool fish action. You do see some crown of thorns, but they have not destroyed the area by any means. I have been to Gun Beach on sunny days and during fairly intense storms. This place takes on a whole new level of cool during the intense tropical downpours you get on Guam. Be careful and mindful of the tides, as you always should be, because there can be a fair amount of current here from my experience. Not being weighed down by SCUBA equipment makes entry and exit a lot easier, but of course limits me at least to about 30 feet depth. I recommend not walking on the coral, but do recommend booties. Follow the pipes until the water is a few feet deep, enough to float yourself out if you are on scuba. You will be a hundred yards from where the water deepens into a very cool small canyon with the depths beyond.