Slow boats are vessels that travel at a slower speed than other boats. They are usually used for leisurely trips, such as sightseeing or fishing. The term 'slow boats' can also refer to two specific types of boats: ARKS and TUBS. ARKS are large, flat-bottomed boats that are typically used for carrying cargo or passengers. TUBS are small, round boats that are often used for recreational activities, such as rowing or sailing.