Tour Larkspur's History At Baltimore Canyon

Here are some of the highlights happening around the Larkspur and Corte Madera Twin Cities area Sept. 14-16:

How well do you know Larkspur and its history? Celebrate the city's past during Saturday's historic walking tour of Baltimore Canyon. The walk will start at the location of the 1849 steam-driven sawmill. The tour will highlight turn-of-the-century homes, campsites used by early vacationers, and the unique forest setting that made “Larkspur Canyon” a popular summer destination. Meet at the historic oak tree in the center of West Baltimore Avenue at 10 a.m. THe walk is free. For information, contact (415) 924-6976.

Check the or Announcements for more things to do, or to post your own activities. Meanwhile, here are a few things to enjoy:

• Black holes and bubbles?: Do you enjoy blowing bubbles? Well, it turns out so do black holes. There's more going on in the sky than we thought, according to renowned scientist Caleb Scharf, author of Gravity's Engines: How Bubble-Blowing Black Holes Rule Galaxies, Stars, and Life in the Cosmos. Black holes don't just suck in everything around them — including light — they produce bubbles. Join Scharf to talk about black holes, white holes, galactic bubbles and other heavenly events Friday at 7 p.m. at Book Passage in Corte Madera. Believe me, this is the kind of cool stuff that can make a child want to be a scientist.

• Coastal Cleanup Day in Larkspur: The Friends of Corte Madera Creek Watershed will be hosting a cleanup for the 28th annual Coastal Cleanup Day at the Larkspur Landing Ferry Terminal on Saturday, from 9 a.m. to noon. Come prepared for variable weather and three hours on the shoreline (hat, sturdy shoes, sunscreen, work gloves and water).

• Get on the bike: Meet at the DMV on Tamal Vista Boulevard on Saturday for a series of important bicycling classes. REI is offering a "How To Ride A Bike" class ($65 members, $85 non-members) for everyone, as well as "How to Ride a Bike for Kids," focused on teaching children ages 4-11 to ride ($45 members, $65 non-members). An introduction to road cycling is already sold out and space is limited for the other two classes. The general class starts at 9 a.m. Saturday. The children's class starts at 1 p.m.

• Book sale to benefit Hospice: Looking for a good read? Scour the Book Passage Annex on Saturday, 9 a.m. to 5 p.m., for a half-price book sale to benefit Hospice by the Bay. The entire stock of used fiction, mysteries, romances, and children’s books, plus used non-fiction on topics including cooking, biography, art, travel and self-help, will be 50% off the already-reduced prices. Proceeds help support Hospice By The Bay’s care of patients coping with life-limiting illness and their families.

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