Charles River Canoe and Kayak (CRCK) offers outdoor water adventures for the greater Boston area from July to November. It provides guided tours and group outings on the Charles River and around Boston Harbor, as well as ocean trips. CRCK also offers canoeing, kayaking and paddleboarding lessons, with specialized classes for kids. Customers can also rent or buy new or used equipment. The facility sells recreational, light-touring, sea, tandem, racing, kids, sit-on-top, folding, inflatable, white water and surf kayaks, in addition to canoes and paddle boats. It has five rental locations, in Boston, Cambridge, Natick, and two in Newton. Hours are seasonal, so visitors are advised to check the website regularly.