You can get a Patelco Credit Union credit card cash advance at any ATM displaying the MasterCard logo using your card and PIN. You could also ask for a cash advance in any bank lobby with your card and a photo ID.
But I would really advise against doing a cash advance. The cost of it outweighs any short term benefit it might bring. Patelco Credit Union's cards have a cash advance APR of 9.20% - 17.15% (V), depending on the card. What's more, they charge a 2% (min $2.5) cash advance fee and you could even be charged with ATM fees.