A large number of trails in the Santa Monica Mountains just burned. On the southern end of the Santa Monica Mtns trails like Sullivan canyon and ridge are open. Sections of the Backbone Trail as well. Simi Valley has some great rides. Mt Wilson Shuttle is really fun. Google them. Santa Babara is still recovering from fires from last year. There are rides but its questionable if they are open. Laguna Beach area has some amazing rides as well as Alpine in the San Diego area. Shuttling Mt Pinos is fun and Santa Clarita has some great trails.