Boat Rentals business. If you own a boat that sits on land more than water, consider renting it out for others to enjoy. Business Overview Renting small, motorized, runabout boats to fishermen can be a very lucrative rental business venture to establish in your area. Fishermen travel far and wide in search of the perfect fishing hole. The business can be water-based and operated from a marina or rented dock facility. Or, the business can be land-based and the boats can be...