There are a few mountains in Vũng Tàu, but actually accessible are only a few:
- Nghinh Phong, Núi Nhỏ, 138 m, Wikipedia - Christ of Vũng Tàu, its more about the largest Christian statue across Asia
- Núi Tao Phùng, 176 m, Hải đăng Vũng Tàu (Vung Tao lighthouse) - closed during the night, good view over to the statue of Christ
- Núi Tương Kỳ, 245 m, Núi Lơn, but now has the Du Lịch Hồ Mây with 400k entrance. You can also take the cable care there, some 450k
- Núi Vũng Maý, 220 m, nice round trip on AllTrails, see also Núi Vũng Maý I
From these 4 mountains, only the first and the last one are actually good hiking opportunities. The third one has only a motorbike road leading up, so you share the hike with some bikes.