Boat Rental business. Business Overview Renting small, motorized, runabout boats to fishermen can be a very lucrative rental business venture to establish in your area. Fishermen travel wide and far 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 rented with a trailer. To get started, design colorful brochures and distribute them to hotels, motels,...