What? No "Joe Vs. The Volcano"? Actually I'm not sure how good that was. I know I liked it at the time, but I was 12 or 13 when I watched it. I'd have to go with:
Gump
Pvt. Ryan
Catch me if you can
Cast Away (everyone hated that shit but I thought it was pretty good)
Big
The Money Pit
Tom Hanks has played in ALOT of good roles over the span of his career...after thinking of all the movies he has been in, he is one of the top actors around