There's good news at Tilden Nature Area on Berkeley's border. A sewer upgrade project that limited access to Tilden's Environmental Education Center and Little Farm has been completed, and Central Park Drive has reopened.

So now you don't have to detour. You can once again get to the center and farm by parking at the north end of Central Park Drive and walking a short distance. The Little Farm animals that were moved during construction are back home again, and normal farm activities have resumed.

Besides upgrading the sewer system, the project involved renovating the restrooms, repainting the center interior and making the center and its toilets more disabled-accessible.

The center is open from 10 a.m. to 4:30 p.m. Tuesdays through Sundays. The Little Farm is open daily. For information, call 510-544-2233. And there's more. Farther up Central Park Drive, Tilden's vintage Herschell-Spillman merry-go-round has reopened under new management. Hours of operation are 11 a.m. to 6 p.m. daily through Sept. 1. Tickets can be purchased at the ride.

As long as we're talking about Tilden, there's a snake program at the center from 2 to 3 p.m. Sunday led by interpretive student aide Sam Fuller. It's a chance to see a rattlesnake under safe conditions, learn how snakes serve a beneficial purpose in the wild and find out how to coexist with them.

Redwood Regional: Hikes for Tykes, a series of free, 1-mile nature walks for young children accompanied by parents, will convene at Redwood Regional Park on Tuesday. Led by naturalist Sara Fetterly, the walk is from 10:30 to 11:30 a.m. Meet at the Canyon Meadow staging area. To get there turn into the park entrance on Redwood Road about 2 miles east of Skyline Boulevard, and drive all the way to the end. For information, call 510-544-3187.

Crab Cove: There will be tales of whales during Family Nature Fun Time from 2 to 2:30 p.m. this Saturday and Sunday at Crab Cove Visitor Center in Alameda. There's a different program each weekend, after which it's fish-feeding time from 3 to 3:30 p.m. at the visitor center aquarium. Crab Cove is at 1252 McKay Ave. off Central Avenue in Alameda. For information on Crab Cove programs, call 510-544-3187.

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