You can climb the serpent stairs, the path, or take the lift up to this historical site on Tang Kuan Hill. Beautiful views in all directions of the Gulf of Thailand and Songkhla Lake. You can see the Sala Vihan Daeng, royal pavilion built during reign of King Rama V, or the Dvaravati chedi tower, with the Buddha relics, ring the temple bells for good luck, pose by the brass prayer bell collection or pose by the bell heart frames. Long-tailed Macaques come out of the jungle and approach people because locals buy fruit from vendors to feed them. You can look out to the north/west and see Samila Beach, just below, with its many vendor stands.
This is also known as Tang Kuan Hill as the word Khao means 'hill' in Thai language. It is also popularly known as 'Monkey Mountain'. The temple is quite small and can be seen in a few minutes, but the view is spectacular from the hilltop which can be reached by the funicular railway (cost 30 baht return) or you can walk up some steps on the opposite side of the hill for free. These steps go through some jungle and some there are some ruins of other temples on the way up. It will take at least half an hour walking each way if you choose this option and can be very hot. Make sure you take water with you. From the top you can take nice photos of Songkhla and the surrounding countryside including the range of hills on the way to Hatyai. If you want some more gentle exercise you could take the railway up and come down by the steps. However make sure you have a map of Songkhla so you know where you are when you come down because you will be on the opposite side of the hill.