Was there last year in Thailand and Vietnam and I nerded out by buying this at a book store and bringing it with me.
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amazing book! tells you everything from local scams in each city, best restaurants to go to, best hostels, how to get to each city on bus and major places to go visit. Traveling on a budget
I wasn't on a budget but this book helped a LOT. If you're unsure of where to go it's even got a small section on how many days you'll be there and it'll give you examples of an itinerary to suit the time frame to max out your experience on an amazing budget!