Tilden Nature Area in Berkeley will mark the longest day of the year with its Summer Solstice Celebration from 6:30 to 9 p.m. June 20, featuring a nature walk, a campfire, children's crafts and poetry and song supplied by the participants.
Registration is required, and there's a fee of $6 per person ($8 for nondistrict residents). For registration and information, call 888-327-2757. Select option 2 and refer to program 29439.
Tuesday Twilights are a series of naturalist-led hikes suitable for families, but not for large organized groups.
Del Valle Regional Park south of Livermore will be the venue for a twilight hike from 7:30 to 10 p.m. June 19, led by naturalist Cat Taylor.
This is a short, steep hike to a hilltop for perfect stargazing on a moonless night, a program designed for ages 7 and older. It's free, though there is a parking fee at the trailhead lot.
Bring water, a snack, a blanket to lie on and a flashlight. Walking sticks are advisable if you have knee problems. Meet at the staging area at the end of Arroyo Road in Livermore. It's across the road from Camp Arroyo. There is no access to the starting point from Lake Del Valle. For more information, call 510-544-2233.
Naturalist Bob Kanagaki will take some reptilian friends on a road trip June 16, to meet and greet park visitors. His first stop will be from 9 to 10 a.m. at the amphitheater in
Black Diamond Mines Regional Preserve in Antioch will observe Father's Day with a free open house from noon to 4:30 p.m. June 17, at the Underground Mining Museum. Visitors ages 7 and older can take a self-guided tour of the 19th century mine where many fathers and sons worked to extract coal and silica.
For younger kids, there's a chamber with hands-on activities just inside the Hazel-Atlas mine entrance. And all ages are welcome in the nearby underground Greathouse Visitor Center.
Black Diamond Mines is at the end of Somersville Road, four miles south of Highway 4. There's a parking fee of $5 per vehicle. For information, call 888-327-2757, ext. 2750.
For a moderate-length, leafy, naturalist-led stroll, bring your family up to Huckleberry Botanic Regional Preserve in the Oakland Hills on June 17, to take a 2.3-mile walk from 10 a.m. to noon.
Huckleberry is a shady, wooded park, home of the rare and endangered Alameda manzanita. It's located on Skyline Boulevard about a mile south of the intersection with Grizzly Peak Boulevard.
No dogs, please. The hike is free; for more information, call 510-544-3187.
Email Ned MacKay at firstname.lastname@example.org.