River Relay is a thrilling and spectator friendly event that the entire city will enjoy, join the fun! Kayakers will travel 3-miles down the scenic San Antonio River before tagging their partner. Then the other team member will run 5k back to the starting point. If you want to do the entire race by yourself, sign up to do it solo. Or, if you only want to run or only want to kayak, you can register for those two option too! Everyone is welcome to enjoy the after-race celebration at Mission County Park.