I know it expires on 5/25, just want to make sure we can go to the park on 5/25/. FL dream pass could explain the higher crowds this May I would assume?
Yes, you can go to the parks on May 25. From Cheshire Figment's sticky:
The tickets will be sold up until May 25, 2010 at WDW or until May 21, 2010 and off-site locations. All tickets are valid until 11:59pm on Tuesday, May 25, 2010 even if there are unused entitlements. The No Expire option cannot be added.
As far as crowds, www.touringplans.com is reporting May 25 as a 4 day for crowd level. It's about the lowest we see anymore. You can read about it here: