With its spaceship-looking trimaran hulls designed by John Shuttleworth and built by McConaghy Boats, the 140-foot superyacht Adastra just has to be included in this roundup. I mean, can you imagine pulling into the marina aboard this yacht? Represented by Asia Marine, this long-range explorer houses six guests in three cabins. Adastra’s maximum speed is 23 knots, but it cruises 10,000 nautical miles at 13 knots. Charter guests will appreciate the fishing and snorkeling gear, water skis, and 16-foot tender as well as the paddleboards and kayaks. Pricing starts at $70,000 per week (excluding expenses) for cruising in the Caribbean this winter and Indonesia this summer. The yacht is represented by Asia Marine.