Bring all the film you want. Nothing like being short of film for those memories.
Just a word of caution. Do not pack the film in your checked luggage. The airlines have a very strong x-ray and can ruin film.
What I do and has worked, is to take all the film out of the plastic cylinders and place them in a zip lock bag. When you go through the carry-on security take the zip lock bag out and pass it around and not through the x-ray.
After you take your pics mark the film cylinder with a marker (an x will do) to show you that these are exposed film. Once again put them in a zip lock bag and pass them around the x-ray security, including any unexposed film in a different zip lock bag for organization.
Round trip San Francisco Mex Riv, Mercury May 4, 2005
Transatlantic from Rome on Galaxy Oct 17, 2005
Round trip Los Angeles to Hawaii, Summit March 26, 2006