To answer your original question, I usually tip $100 per boat per day. I research (actually my fishing buddy does) the guide or fish with a guide who I've fished with before. I know I'm going to get top quality service and have an enjoyable day. If we get skunked and the guide worked his butt off to do everything he could to get us fish, that's $100 for me. I don't use guides often, but if I find a good one, I'll likely use them again. I'd rather be remembered at the start of a subsequent trip as the client who tips well. Just my humble opinion.