I too would highly recommend the ISO 400 film speed. It is general purpose (indoor and outdoor). You just don't have the luxury of beeing able to change film speed on the fly like with a digital camera.
I doubt you'll need a tripod if you're only taking 28mm and 50mm lenses. You will be wishing you had more reach though. Something like a 50-200 zoom would be good.
Hope you have a great trip
Have fun,
Doug