According to the Golden-State Tourism Board, the appropriate means of entry is as follows:

1) Go to Nevada.
2) Get yourself an eight-ball and a forty.
3) ???
4) Wake up in a tool-shed in South Central next to a male prostitute dressed as Santa Claus.

An alternative:

1. Find a fat girl who lives in SF and go hit on her on FB.

2. Tell her she's beautiful and you love her.

3. Suggest you move in with her.

4. Tell her you're a virgin and saving yourself for marriage(so you don't have to do stuff with her).

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If you're just interested in visiting the area, might I suggest Couchsurfing?