Even if you hire a bike to visit Angkor wat, you should find a tour guide. So you will understand more about Angkor wat. The Angkor's history is very interesting. And the tour guide will take you to all the most beautiful temples. In Vietnam you can go diving in Nha Trang, Mui Ne, Phu Quoc. In the north you can go diving in Co to island but it's not very beautiful. Phu Quoc and Nha Trang is the best choice.

Sihanoukville is the most famous for diving in cambodia.