Walk over to Lake Merritt and have a drink at Lake Chalet. The lake is almost a perfect 5k if you’re into running outside. Lots of gentrification going on. Lots of restaurants and bars on Broadway in the Lake Merritt district, if you don’t feel like walking the 15 minutes go down to Jack London square and sit outside and have a beer at one of the breweries or go have an overpriced hipster pizza at Forge and watch the boats come and go. If you’re into legit dive bars goto Merchant Saloon. Opens at 7 am. Uptown Oakland is also worth a look.
Or just stay in your room and complain about all the scary homeless people and how bad of a state California is.