Segway in SF?
Harley in the city:
Harley Davidson Rentals - Rent a Harley | EagleRider
However, you probably will have a harder time navigating through the idiots than enjoying the sights!
Are you going down Highway 1 to Venice Beach?
Make sure to stop in Pescadero for some food, go out to the Wharf in Santa Cruz, get some Clam Chowder at Stagnaro's at the end. You could probably grab a campsite at sea cliff Beach in Capitola/Aptos. My friend Larry owns Aptos St BBQ in Aptos. BBQ Brisket - delicious! Or, make your way to Watsonville/Moss Landing and stay at Sunset State Beach. Curve around, you could Rent a Harley in Monterey/Seaside, and see the coast, Pacific Grove, and 17mile drive. Better than the traffic in SF.
Make sure to stop in Carmel. You can also get a great campground for a decent price, and good facilities, at Laguna Seca Raceway. Try to make your way up to the Chaparral loop, great views.
Head down to Big Sur, take some pics at Bixby Bridge, stop for food in some of the hidden gems at Big Sur. Want a classy meal?
https://www.google.com/url?sa=t&rct...Va5I2OezqET3aniFg&sig2=ZJYsD4jZZtWEGwYn0prOKg
Then down to Hearst as suggested, then Morro Bay/Pismo Beach. Stop at Madonna Inn. Champagne Cakes, and bring a small bag to bring home a souvenir glass (just order a soda, and a glass of water, that way there is always at least 1 glass on the table

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Just a few suggestions..