Something must be brewing in the fishing chat rooms about passports since we are receiving so many emails and calls about it. At this time, a passport is not required on our trips, unless specified otherwise. A government-issued photo ID (drivers license) is sufficient for now.
We always suggest that a passport book or the cheaper passport card be obtained for the future, since that will probably become a requirement. All the application procedures are here: http://travel.state.gov/passport/
We would let everyone know with a LOT of lead time if a passport was required on a fishing trip, as they can take many weeks to receive after application.
Thank you!