The 2017 Summer Longest Causeway Run & Fitness Walk will follow a course starting at Schlitterbahn Beach Waterpark on South Padre Island, continuing on to the Queen Isabella Causeway and over the Laguna Madre Bay and ending in front of the Port Isabel Event & Cultural Center. Awards ceremony will be held immediately following the event. Online registration for the Summer Longest Causeway Run & Fitness Walk is NOW OPEN! Register before May 23rd and take advantage of our early bird registration fees! Both the 10k & 5k courses start at Schlitterbahn Waterpark. Both cross the historic Queen Isabella Causeway and end in Port Isabel. Every participant to cross the finish line will receive a medal and T-Shirts are guaranteed to the first 1,000 participants to check in. Run the beach, cross the bay and join the fun!