In order to explore the northern parts of the Phu Quoc island a bit more we also rented a scooter for a day (from the hotel, approx 10€/day).
We first stopped at the river for some kayaking. We rented the kayaks from a lovely restaurant Phuong Vi by the river, which is also a great place for lunch and has really friendly service.
We then drove to the northern tip of the island to a small village where we had been told would be great seafood at Bien Hai Quan restaurants by the sea.
Next, we wanted to go for a beach but struggled finding a nice public beach. In the end we visited the beach of Gold Coast resort before heading back to our hotel.