Talking about the  south east countries such as Vietnam and Thailand for the honeymoon is the next best thing to happen after your marriage. In both these countries the service is impeccable, not only can you have a cheaper holiday but the beauty of these countries is amazing. There are many recommended places i have been recently while travelling south east asia, it basically depends on what is your preference.

Islands Honeymoon
For a Honeymoon in island areas one should go with south down near Phuket Thailand, there are numerous islands including Phi Phi which is where the beach movie was filmed. The scenery is amazing and breathtaking and seafood is plenty. And the beaches are full of snorkeling and diving options.

Another place we would recommend in Cat Ba Island in northern Vietnam which is a beautiful scenic island adorned with national park and breathtaking views. If Vietnam is your place of choice this Island is spectacular for Honeymooner Travel.

Mountain Honeymoon
For mountain places we would recommend Chang Mai area in Thailand and for Vietnam we would suggest Da Lat. They both are very scenic and have a number of romantic places for the Honeymoon needs.

Beach Honeymoon
The last one we would like to recommend is for the sole beach lovers, you could choose the beach option above or just go with a nice beach town. In Thailand there a couple of beautiful places however our preference here would be Nha Trang in Vietnam. All its major Hotels face the ocean with breathtaking room views and beach activities to keep you well and truly busy.

Well that is it for the honeymoon tips for South East Asia. Source