After lunch, you can take bus No.9 to Ocean Park. After coming out of the park, you can walk (estimated to be more than 20 minutes) or take a tricycle to the old street not far away. After coming out of the old street, take the Yintan Line in Beibu Gulf Square and go swimming in Yintan. (Of course, you can also go to Yintan without going to Laojie, because Laojie Bar is actually an old house with several sculptures and then some wheat things. )
3. You can also choose not to go to Ocean Park and take bus No.6 in Guantouling. Well, there are stone mountains and beaches, where many people take wedding photos. By the way, there is also a temple over there.
3. The water outside Yintan is cheaper if it is useful (it seems to be 5 yuan, but the environment is not so good, and the inside is open), and the water inside Yintan Park is more expensive (it seems to be 20 yuan, where there is a compartment, and then disposable slippers, shower gel and so on).
Finally, you go back to Beibu Gulf Square by bus, have something to eat, and then take the 13 bus to the station, so you should be able to catch the last bus. . . .
5. Don't eat seafood in Yintan and Waisha. Not cheap. Beihai bus system is ok. There are buses everywhere you can go. I don't know. I can ask passers-by or shopkeepers. I am still very enthusiastic.
Well, that's all I can think of for the time being. I hope it helps. Have fun!