River Cruises What Qualifies as a River Cruise for the Solo Travel Awards This category is designed for smaller ships cruising rivers in any part of the world. If appropriate, your company may also enter in the ocean cruise, tours or specialty tours, and/or vacation packages categories. Criteria for the River Cruise Category All nominees will []. - Premier is the Solo Traveler Expert! Solo Traveler River Cruise Specials. Booking a solo cruise can be a trying experience. What feels like a punitive “single supplement” can make it seem like you’re paying for two full guests when you’re only sailing for one – and indeed, some supplements do just that.