River didn't do anything but nod as she excitedly asked him about the beach. And soon, once they parked and he had to grab all the supplies from the trunk, she'd figure out that they were doing much more than just staying at a motel or just relaxing on the beach for a few hours.
He spotted a parking spot next to a seafood restaurant, and killed the engine. He didn't get anything out of the car yet though, because they had to go talk to the beach marshall and pay to camp there. Otherwise, they'd get fined.
He placed a hand on her back to guide her towards the beach and approached the marshall, pretty much letting her know right then what they were doing as he paid the guy and was told where they could camp.