After the sedentary pleasures of the Thanksgiving holiday -- turkey and TV football -- the East Bay regional parks stand ready to help you work off the extra calories.

Black Diamond Mines Regional Preserve in Antioch hosts its last mine open house of the season on Saturday, Nov. 24, at the Hazel-Atlas Underground Mining Museum. From noon to 4:30 p.m. visitors can take free, self-guided walks through 1,000 feet of restored 1930s-era silica sand mine.

For safety reasons, the mine walk is limited to ages 7 and older, though there is an underground chamber just inside the entrance where younger kids can hang out for some hands-on fun.

The mining museum will be open Sunday, Nov. 25, for paid guided tours. Then it closes until next March.

Black Diamond Mines is located at the end of Somersville Road, about five miles south of Highway 4 in Antioch. There's a parking fee of $5 per vehicle when the kiosk is attended. For information, call 888-327-2757, ext. 2750.

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    Naturalist Mike Moran continues his raptor population research with a bird-watching walk from 9 to 11:30 a.m. Thursday, Nov. 29, at Big Break Regional Shoreline in Oakley.

    Anyone is welcome to join Mike, and no experience is necessary. The program is free, but registration is required. To register, call 888-327-2757. Select option 2 and refer to program 30694.

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    Children ages 3-5, accompanied by a parent, will enjoy a program from 10 to 11:30 a.m. Thursday, Dec. 6, at Shadow Cliffs Regional Recreation Area in Pleasanton, led by naturalist Katie Colbert. It's "Duck, Duck, Goose," a visit with our web-footed friends, of which there are plenty at Shadow Cliffs.

    There's a fee of $6 per kid ($8 for nondistrict residents) and registration is required. Call 888-327-2757 and refer to program 30610.

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    Katie also hosts "Women on Common Ground," a series of programs for women who love the outdoors but have personal safety concerns. She'll lead a women's hike from 9 a.m. to 2:30 p.m. Saturday, Dec. 15, at Pleasanton Ridge Regional Park in Pleasanton. It's a five-miler to explore old olive groves, with an open house at Hillcrest Ranch.

    The program is free; registration is required. For information, call 510-544-3243. To register, call 888-327-2757 and refer to program 30703.

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    Fungus will be the focus of a free program from 1 to 3 p.m. Sunday, Nov. 25, at the Environmental Center of Tilden Nature Area in Berkeley, led by naturalist Trent Pearce.

    Trent will talk about how to identify common types of mushrooms, then he'll lead a hike to see what is growing in the park. If you join him, bring a snack.

    The center is located at the north end of Tilden's Central Park Drive. For more information, call 510-544-2233.

    There's also a no-pick mushroom walk scheduled from 10 a.m. to noon, Saturday, Dec. 1, at Redwood Regional Park in Oakland, guided by Debbie Viess of the Bay Area Mycological Society, Dan Rademacher of Bay Nature Magazine, and a park district naturalist.

    It's a moderate hike with some hills, and it will go rain or shine. It's free, but registration is required. For registration and information, call 888-327-2757. Select option 2 and refer to program 30903.

    While we're on the subject of mushrooms, here's a word of caution. This time of year, you're likely to see mushrooms all over the place in the regional parks and other open space. Some varieties are edible, others are not only inedible, they can be deadly poisonous.

    Nobody should pick wild mushrooms unless they are expert at mushroom identification. For the rest of us, the best place to gather them is your local supermarket. In any case, it's against the rules to harvest mushrooms or any other plant in the regional parks.

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    If mushrooms don't appeal to you, how about bluebirds and butterflies? Park district naturalists will lead one of their Sunday Strolls in search of the winged beauties, from 10 a.m. to noon Nov. 25. The moderate, 3¾-mile hike starts at the Trudeau Staging Area, 11500 Skyline Blvd., Oakland. For more information, call 510-544-3187.

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    And it's fireside story time from 10:30 to 11:30 a.m. Sunday, Nov. 25, at Tilden's Environmental Education Center. Sit by a warm fire with a cup of hot chocolate and listen to some nature stories from naturalist aide Morgan Rani Evans. You can share some of your own stories, too.

    Ned MacKay writes about East Bay Regional Park District sites and activities. Email him at nedmackay@comcast.net.

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    Crab Cove Visitor Center in Alameda plans a full day of family-friendly activities from 10 a.m. to 4 p.m. Saturday, Nov. 24. The schedule includes close-up encounters with live fish, crabs, turtles and a gopher snake, nature walks and nature-themed crafts for the kids.

    From 10:30 a.m. to 12:15 p.m., there's a big-screen program about bay and ocean wildlife, accompanied by popcorn and cider. From 1 to 2 p.m., naturalists will lead a hike to see the shorebird feeding frenzy on the mud flats. Low-tide exploration is from 2 to 3 p.m., and fish feeding at the aquarium from 3 to 3:30 p.m.

    All the programs are free. Crab Cove Visitor Center is located at 1252 McKay Ave. off Central Avenue in Alameda. For more information, call 510-544-3187.

    Ned MacKay writes about East Bay Regional Park District sites and activities. Email him at nedmackay@comcast.net.