Chinatown is fine with me. I think it's more satisfying to keep the geography smaller, so that when we share our drawings, we can see how others viewed the same or similar topic.
I think the Academy of Sciences is a great spot to sketch, too. I've sketched there many times, but I'm a member. It's $25 per person normally, so I think in this economy it's asking a lot of people. [Just a plug though, an individual membership is $99 and it's good for 2 people, so if you visit at least twice in the year, it's paid for.]
The Bridge is a good choice for later in the year (October), when the weather is better. Right now, it's VERY windy. The Presidio is a good choice, too. Especially because the Lucas Arts' Starbucks is a comfortable place to end up on a weekend.
But I have another suggestion for later in the year, when the weather is good: Sausalito. Aside from trekking to the residences on the hills, it's a pleasurable place to walk. The weather is usually good, there's great views, lots of people, places to eat and drink, etc. And just a short drive away, there's the new Inn at Cavallo Point which used to be known only as the Coast Guard Station at Ft. Baker, but now it's a choice destination. The food is pricey, but there's a good bar there called Farley's, named after the late cartoonist, Phil Frank's character, Farley. The place has a beautiful public porch lined with rocking chairs and an eye-popping view of SF and the Golden Gate. The architecture is interesting - kind of mission colonial/arts & crafts and there's good parking (no public transportation though, the closest you can get is the GG Transit bus to Sausalito, getting off at the top of Alexander Avenue). And it's a hot spot for bicycles and the people who ride them.
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