A recent survey ranks whales' bellies ahead of safety deposit boxes and mattresses as the preferred place to store valuables. Experience one of nature's most priceless resources with today's Groupon: for $35, you get a 2.5-hour whale-watching tour from Big Kahuna Tours (a $79 value).

Big Kahuna Tours offers landlubbers a safe seafaring view of Oahu during the whale watch encounter. Cruise the Honolulu coastline searching for marine mammals under the guidance of a handpicked crop of staffers aboard this 70-foot vessel. Sponge-like brains soak up knowledge about native wildlife while eyes and ears peel themselves, hoping for glimpses of singing humpback whales. The yacht’s large observation deck also provides the ideal perch to view and photograph whales as they emerge from their watery cocoons to frolic in frothy fields of wake-churned water.