M22 Challenge Rentals If you booked a Kayak, SUP or Bike Rental through Crystal River Outfitters in 2020, your reservation still stands. If you are in need of a Kayak, Bike or SUP rental for the June 2022 Challenge, you may book here: Book Challenge Rentals Online! Please do not call with questions. Please email [email protected] so we may handle inquires appropriately! Thank you!