Depends which area, on the smaller islands (which IMO are more fun) you can expect to live in some decent accommodation for $25 USD a night (depending on whether its peak season or not), meals are approx $4-5USD each. if you want to stay in a hotel, then expect to pay a fair bit more.
extracurricular activity costs depends on what you do.
scooter hire per day works out to be around $6USD per day, gas is pretty cheap too. drinks are around $1USD per beer if not cheaper, cocktails youre looking at $2-3USD.
$25 USD a night for accomodation? For a nice hotel maybe but you can pay much much less.
$4-5 for a meal? Try more like a dollar. You obviously only ate in tourist restaurants, it's all about the street food and the local cafes where a dollar will get you a tasty local dish and a drink.
I always thought it was cheaper there but I guess the dollar has suffered a lot in recent years.
It is cheaper than that. You can stay in private rooms in hostels and guesthouses which are usually a very high standard with aircon and ensuite for between $10-$20 in Bangkok and most other places a private room in a guest house will cost you around $5 a night again with all mod cons. If you don't mind sharing them a dorm room from between $3-$10 depends on quality and location.
Food is incredibly cheap and amazingly good. Like I said $1 will get you a meat dish, with rice and a drink. The portions aren't huge but they'll do.
I might go back to Plan A, which was Ho Chi Minh City (Saigon).
Anyone ever taught/lived in Vietnam?
Have you been to Saigon before? If not I'd recommend visiting first to see what you think.
I've been twice and the first time round was OK because it was only for 3 days and I spent one of those at Mekong Delta and other at Cu Chi tunnels. The second time was for around 12 days and I hated every second of it. It's a horrible city, depressing, more over crowded than you can imagine, pollution and traffic is insane, noise levels through the roof, people aren't particularly friendly, there's not really much to do. One of the worst places I've visited in SE Asia but I wasn't overly impressed with Vietnam on the whole, there were good parts (Halong Bay, Nha Trang, war museums n history etc) but found everywhere just too busy and chaotic and not in a good way like some Asian cities can be. Saigon doesn't have that energy or excitement like say Bangkok does for example, it just comes across as being too crowded.
Apparently it has the highest wages in SE Asia for teaching though so that's a consideration if money motivates you. Personally I'd go to Thailand or Cambodia over Vietnam anyday. Much nicer places (Laos is too though not sure I'd like to live there), friendlier and just a better vibe in both countries I feel.
I plan to move to Thailand in the near future. I'll probably be back there as well as Cambodia and Laos for a few months near the end of the year but I won't revisit Vietnam.