Three Rivers is Maine's #1 Outdoor Outfitter in Rafting, Lodging, Nightlife and Skydiving! Let us show you what "The Home of Serious Fun" is all about! Come Maine Whitewater Rafting with Three Rivers Whitewater. White Water Rafting Maine - Three Rivers is your home of serious FUN, whitewater rafting on the Kennebec, Penobscot and Dead Rivers, variety of lodging.