Spectators and participants are welcome to the 18th Annual San Diego International Triathlon, July 1. For exercise with a dash of wacky fun, guests must try the Midnight Madness Fun Bicycle Ride , August 18. Participating bicyclists are invited to wear pajamas or costumes for the scenic, 20-mile ride through popular sites in the downtown San Diego region. During the San Diego Balloon Association Hot Air Balloon Classic , July 4. The Annual U.S. Open Sandcastle Competition takes place at the Imperial Beach Pier, July 27-29.
Guests can marvel at fanciful sand sculptures of every description.