Bird Rock Coffee Roasters is ranked as the best coffee shop here. Their latte is amazing and muffins are good too. Might get a little crowded but is always a good spot to work as it has free Wi-Fi too.
T-Mobile Downtown is an electronic store which provides sim cards. Their customer service is great and plans are also good.
There are bikes (and some scooters) all over certain areas. You download the app and you can rent them to get around. The first 30 minutes are free and you can leave them just about anywhere. You don't have to leave them in a specific spot or anything.