A sense of humor is always a great start! Along with that some things to consider are:
* good shoes with rubber soles
* rain gear - to look the part
* your lunch, beverages and plenty of snacks (we allow a moderate supply of beer but no drugs or hard liquor - we're here to fish)
* If your prone to seasickness, take a motion type pill at least two hours before the trip
* A Camera to record the Big One to prove it didn't get away!