I've only been a client, but I've seen plenty of bad ones.

Tips for clients:

Leave the attitude at home, you're out there to relax. Nothing can spoil the mood on a boat faster than a abrasive, overly confident person. Confidence and assertiveness are good, but there is a point of diminishing returns.

Be on time, even better, be early. It shows consideration for others.

Ask the guide if there is anything you can do to help out. Yeah, you hired him, but he isn't your lackey. Always work together with other people on your boat. It will always lead to a more enjoyable time.

Bring your sense of humor.

Talk with the guide BEFORE your trip about what type of fishing he will get you into, methods, etc. Let them know your preferrences, and be flexible. They fish the water all the time.

Bring an open mind and be ready to learn something. The day you stop learning is the day you die.

If you drink, do so in moderation. Boating is serious business, and you don't want to be a burden on others in a life threatening situation.

Be a good human. Would your kids be proud of the way you acted?

Andy