Travel from Helsinki, Finland, through the three Baltic states of Latvia, Estonia and Lithuania with Bill Altaffer.
When, where: 7:30 p.m. Monday at Distant Lands, 20 S. Raymond Ave., Pasadena.
Admission, info: Free. RSVP to (626) 449-3220.
Get tips on hiking the three tallest mountains in Southern California: San Antonio, San Gorgonio and San Jacinto.
When, where: 6:30 p.m. Thursday at the Adventure 16 store in Tarzana, 5425 Reseda Blvd., and Friday at the Los Angeles store, 11161 W. Pico Blvd.
Admission, info: Free. (818) 345-4266 for Tarzana; (310) 473-4574 for Los Angeles.
Learn basic astronomy and observational techniques before heading into the national park to observe the night sky.
When, where: 2-10 p.m. Saturday, Oasis Visitor Center
Admission, info: $70. (760) 367-5535