It's a boat, and it's big enough to sleep on, why not keep it happy in a marina slip or mooring. You'll want to learn about antifouling paint bottom paint, applied to the hull below the waterline. Salt or fresh, if you leave your boat in the water for more that a few weeks stuff will grow, critters will attach.... and you'll have a slow, ugly boat. Slipping on a dive mask cleaning the hull yourself is one option, if there's a shallow beach area conveninent a long broom handle with a soft brush attachment will let you get most of if it. The best option, however is a couple coats of anti-fouling paint. A gallon should be enough, then check it once a month or so and wipe the water line... just like a swimming pool
Okie Dokie, here's a link to the
West Marine Advisor's articles on antifouling paints. Read up on this subject to decide which style of paint will work best for your boat situation. There are advantages and disadvantages between the two major types ... For instance, if you trailer or store your boat out of the water you don't want to waste your money on a paint that deteriorates quickly when exposed to air or sunlight. If you store your boat in the water year round and don't want to haul out for seasonal re painting, there are products that can last much longer, saving you time and money. Just learn as much as possible, and I emphatically encourage you to ask your marina staff, your dock friends and boat neighbors how they maintain their boats and what products they use.
By the way, applying a couple coats of bottom paint is an easy DIY project. YouTube is your friend.