December 2, 2023 Rehoboth Seaside Marathon. A full and half marathon that begins on the Rehoboth Boardwalk and winds through the trails of Cape Henlopen, rain or shine. Normally 3,000 plus or minus runners participate. We provide communication to the Mobile Command Unit for runners needing assistance along the route and how the race is progressing TO VOLUNTEER, email: [email protected] For Information about the event: https://www.rbmarathon.com/