Surfing with a paddle is great for building upper-body strength, increasing aquatic maneuverability, and disciplining profanity-spewing pelicans. Regulate aqueous agitators with today's Groupon: for $39, you get two half-day paddleboard rentals at Blueline Paddle Surf in Jupiter (an $80 value).

Blueline Paddle Surf bestows each thrill-seeking sunbather with a surfboard and single-bladed oar to navigate calm, glassy currents and slice through frothy spumes of rough-and-tumble saltwater. Like towering leaves imported from the Pleistocene epoch, a wealth of enormous paddleboards line the walls of Blueline's shop, awaiting a bathing suit-clad water warrior to set it free on the flat water. Launch a half-day adventure off the Jupiter coast with a friend or challenge an enemy to aquatic jousting. Wave riders as young as 9 are welcome to test their strength, and paddleboarders of all skill levels are encouraged to frolic on the gentle rolling waves. Rentals are hard to come by on weekends, but visitors may call ahead and make a reservation or stop by during the week (Monday–Saturday 10 a.m.–7 p.m., Sunday 10 a.m.–6 p.m.) and shake off the post-work blues.