The ocean shapes our coasts with currents, tides, waves, and giant sea monsters with an affinity for building sand castles. Spy the sea's fantastical forces with today's Groupon: for $64, you get a mini-speedboat tour from Seaforth Boat Rentals in Coronado (a $128 value). Tours run every day of the week at 9:30 a.m., 3:30 p.m., and 5:30 p.m.

Seaforth's skilled staff guides water riders on scenic 90-minute mini-speedboat tours through the San Diego Bay, giving guests the mobile sensation of a flying fish and the wind-blown hair of a zooming porpoise. With the thrum of 30-horsepower motors and the roars of seagulls in their ears, tourists get water-top views of local attractions such as the Midway aircraft carrier and the Star of India, as well as gregarious sea life. Seaforth's aqua-steeds feature an electric start, smooth steering, and enough room for only two people⎯ making it ideal for a more personal aquatic adventure or a secluded location to rehearse upcoming karaoke duets. Boats gather in small groups of up to five vessels, as hydro-crafts make wave donuts, search for surface treasure, and chase after accidental ghost ships.