One thing I could see going very well in Vietnam, is a water park. I never really noticed, but are there any water parks in Vietnam? And if so, which ones are worth checking out? Next time I go out there, I would love to check it out.
Dam Sen Water Park in Ho Chi Minh City, Vietnam
I would love to go to a water park in Vietnam, especially in Vietnam, as I bet they get crazy with theirs. :) Anyway, will have to look them all up when I go to Vietnam next.