Among the multitude of yachts available for charter in the Mediterranean this summer, the Lürssen-built Quattroelle (http://www.lurssen.com; available for charter through Moran Yacht & Ship, www.moranyachts.com) stands out. The 289-footer, which the German shipyard delivered in February, has a range of 6,000 nautical miles, accommodates 12 guests in six cabins, and has room for a crew of 28. Weekly rates for Quattroelle start at about $1.3 million. Other highlights include an eight-person hot tub on the top deck, a countercurrent swimming pool, and an assortment of water toys and tenders. The yacht also has a gym, a hair salon, a massage parlor, a cinema, and an art gallery.