The wife and I visited Da Nang back in October. I used the ATM (with US debit card) without any issues. Advise to make a conversion cheat sheet because you will have a few million viet dong in your wallet and the mental math drove me crazy. Current exchange is approx 23600 to $1. If I recall correctly, some vendors will drop the last three zeros when giving you the price. I thought the prices for food, beer, tours were reasonably cheap...even at our hotel lounge. IMO, a must see when visiting Da Nang is the Ba Na Hills (suggest a Google search). I'm sure your hotel Guest Relations person can arrange everything to include a driver. It's an all day trip and you will do plenty of walking once you get to the top (you take a long cable car ride to the top of the mountain). Again, the prices for food and drinks were quiet cheap inside the park. Although our hotel advise against it, we ate seafood platter at the night market (the tail end of the Dragon Bridge)...lobsters, shellfish, etc and 4 beers for about $35 . We didn't have any issues (we often eat street food in Chiang Mai) but if you have a sensitive digestion system, you may reconsider. Good luck and safe travels