See #5 on this list.

Oakland City Center Marriott has been recently renovated and is just across the BART station.

There is also the free Broadway Shuttle that goes to the waterfront (Jack London Sq).

You can take the ferry to SF or Alameda (check out the tasting rooms in the vicinity of the ferry terminal: Rockwall, Rosenblum and St George's Spirits).

No ... not trying to have the most hyperlinks in a reply