June 19-December 31: Boyz in the Woodz Club Sunday HikeJoin the SF Bay Area Gay & Bi Men's Hiking & Social Club for brunch, a hike, fun events, or dinner http://members.aol.com/BITWClub. ($10-12). (415) 457-3993.
June 22: Double DipseaA 13.7-mile trail run. Stinson Beach parking lot. (415) 978-0837.
June 28-29: International Gay Rugby Tournament:San Francisco Fog Rugby Football Club hosts The International Gay Rugby Association's rugby tournament and festival. Polo fields, Golden Gate Park (free). 10 a.m. www.sffog.org
July 28: Chronicle Marathon Also a 5-kilometer run. Golden Gate Bridge. (415) 284-9490
July 21: Humbug Hurry-up Mountain Bike Race A 9-mile course along woodland paths ($30). Start/finish line at Upper Greenhorn Park, Yreka. (530) 842-1649.
August 11: Festival of ChariotsThe west end of Speedway Meadow, Golden Gate Park. (415) 841-7618.
August 3: 13th Annual Alcatraz Sharkfest Swim A 1.5-mile swim from Alcatraz to San Francisco. (415) 868-1829. envirosports.com.
August 4: The Chronicle Tour de Peninsula A 33-mile bike ride of the San Francisco Peninsula with 1-mile and 21-mile shortcuts, rest stops, food and drinks, tech support, and expo. (415) 759-2690. www.rhodyco.com.
August 8-11: World Footbag Championships Don't call it hacky-sack, these folks are serious. Think volleyball -- with your feet. (415) 522-9899. www.footbag.org.
August 25: Aloha Celebrity Races & Polynesian Festival Outrigger canoe races, hula dancing (free). Santa Cruz Boardwalk. (831) 420-5273.