Crystal Lake Adventure Sports is "Your Outdoor Specialty Retailer" - Apparel, Footwear, Gear. Downtown Beulah and Downtown Frankfort. We have a large selection of rentals of Bikes, Kayaks, Surfboards, Standup Paddleboards, Pontoon Boats and Lily Pads. Rental available Daily/Hourly/Weekly. Full service bike shop. Open 7 days a week. Randy & Elaine Newbold.