Mountaineer Courtney Purcell will share lessons he's learned on his climbs around the world.
When, where: 7 p.m. Wednesday at the REI store in Rancho Cucamonga, 12218 Foothill Blvd.
Admission, info: Free. (909) 646-8360
Autumn Sea Fair
Enjoy ocean-related activities such as Japanese fish printing, learning how to cast a fishing rod and searching for buried treasure.
When, where: 10 a.m.-3 p.m. Oct. 16. Cabrillo Marine Aquarium, 3720 Stephen M. White Drive.
Admission, info: Free. (310) 548-7562
Explore the Coxcomb Mountains, a little-visited region of Joshua Tree National Park, on a strenuous day hike led by a National Park Service ranger.
When, where: 7 a.m. Oct. 16, Oasis Visitor Center, Twentynine Palms.
Admission, info: $45. (760) 367-5535.