Remember to stay safe always. Prioritize your safety wherever you plan to go. Many places now are not very safe, so make sure to stay in a good hotel with best security.
I would advise bringing spare batteries for your camera so you can take countless photos. love the south east asian scenery. it's so rich and lush!! You'll really enjoy
Always ask the locals for tips! They might help you find cheap good food too. Most commercialized travel itineraries often include pricey meal options you're better off finding an alternative for.
Search for online coupons for cheap discounts! There are travel sites out there which can offer you discounts on your expenses like accomodation, food, etc.
Always, always - read up articles online on traveling safety and to-do's! Keep your passport with you always. And search for money conversion tips as well.