lightBay seniors not satisfied with the glow of Christmas trees around town are encouraged to check out IlluminateSF’s tour of six fantastical installations in SOMA, North Beach and the Embarcadero on December 27. You’ll travel on a bicycle festooned with holiday lights.Free .The very ambitious Discovery Street Tours  also has a Science of (Holiday) Light tour where you’ll stroll by some of the town’s more amazing seasonal light displays while experimenting with color mixing animation. An hour and a half. $25.

 

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