A sea kayak can carry you over ocean swells or beneath the brush overhanging a tightly twisting stretch of flat-water river. The point, no matter the setting, is to paddle the craft toward adventure, whether harrowing or hardly enough to raise a sweat. As spring flows into summer, the following is a broad palette of New England paddling destinations. Some are better for beginners, others intermediate and advanced. Each is followed by a local outfitter to help get you underway.