Nothing in walking distance once you leave the DLR property. I don’t know that I would Uber there without a car, but touristy things within Orange County might include Laguna Beach for a half day to explore art galleries and have lunch, Fashion Island or South Coast Plaza for shopping, Balboa Island, fun zone and the ferry in Newport Beach, maybe Aquarium of the Pacific in Long Beach. Again, I wouldn’t Uber those personally, it’s a good drive especially with traffic, but if you have a car.