For a close-up look at sealife and the awesome Bay of Fundy tides, Cobscook Hikes & Paddles (207/454-2130, www.cobscookhikesandpaddles.com [1]) leads kayak tours exploring the area between Whiting and Calais. Sunrise Canoe and Kayak (68 Hoyttown Rd., Machias, 207/255-3375 or 877/980-2300, www.sunrisecanoeandkayak.com [2]) leads trips on the Machias and St. Croix Rivers as well as sea-kayaking trips to see Native American petroglyphs in Machias Bay.
Links:
[1] http://www.cobscookhikesandpaddles.com
[2] http://www.sunrisecanoeandkayak.com