MYSTERIES OF FOG, JUNE 2

Santa Rosa: Learn the mysteries of fog and experience a make your own fog demonstration during a presentation by Alicia Torregrosa, a physical scientist with the United States Geographical Survey, 7 p.m. at Pepperwood Preserve, 2130 Pepperwood Preserve Road. Open house with light refreshments begins at 6:30 p.m. at the Dwight Center for Conservation Science. $10 donation, students free. Visit pepperwoodpreserve.org or call 707-591-9310 for information.

TRAILS FOR TOTS, JUNE 2

Sonoma: A free, bilingual, outdoor program for children ages 3 to 4 with an adult includes songs, stories and a short walk from 10 to 11:30 a.m. at Larsen Park, 329 DeChene Ave. Bring water and a snack. Call 707-565-7888 for information.

HIKING & FITNESS, JUNE 3

Glen Ellen: Jack London State Historic Park presents a series of six classes and hikes for fitness on Saturdays this summer. Each class/hike costs $15, and a six-class/hike package is $75. Parking is included. Participants can choose a class/hike that meets their schedule or sign up for all six class/hikes. Learn the basics of hiking from REI and take an easy guided hike on June 3. Subsequent classes address using mindfulness, stretching and yoga to enhance an outdoor experience. The length and difficulty of each hike will increase each week until July 15, with a graduation hike to the summit at Jack London State Historic Park.There is no class/hike on July 1. The hikes begin at the ranch parking lot at the park, 2400 London Ranch Road in Glen Ellen. The class and hike are from 8:30 to 11 a.m. depending on the length of the hike. Class sizes are limited and the hikes are on uneven terrain with varying degrees of elevation gain and loss. Participants might want to consult with their physician before starting the hikes. Visit jacklondonpark.com for information.

COASTAL WILDFLOWERS, JUNE 3

Bodega Bay: Botanist and ecologist Peter Warner leads a 5-mile, moderately steep hike along well-worn dirt and gravel trails hrough coastal grassland, shrubland and small patches of forest. The hike is from 9 a.m. to 3 p.m. Meet at Shell Beach. $16 for Stewards of the Coast and Redwoods, $20 nonmembers. Register at stewardscr.org or call 707-869-9177.

TIDE POOL TALK, JUNE 3

Bodega Bay: Explore marine life in tide pools at Doran Beach from 11 a.m. to noon at 201 Doran Beach Road. Bring water and a snack, Parking, $7. Call 707-875-3540 for more details.

SONOMA RACE REGISTRATION, JUNE 4

Sonoma: Register now for the Hit The Road Jack! race on June 4 at the Sonoma Plaza. Half-marathon starts at 7:30 a.m. The 10K and 3.5K start at 8 a.m. The 540-yard Kids Dash for ages nine and under starts at 10 a.m. After-race festival with food, beer and wine is hosted by the Sonoma Volunteer Firefighters Association. Visit hittheroadjack.org or all 707-996-2102 for information.

TREK TOLAY, JUNE 4

Petaluma: Walk 5 miles through gently sloping terrain from 9 a.m. to 3 p.m. Sunday at the newly-expanded Tolay Lake Regional Park, 5869 Cannon Lane. Parking, $7. Registration required at parks.Visit sonomacounty.ca.gov or call 707-483-0940.