If a stranger walked up to me while I was fishing I'd be more than happy to talk to the guy, maybe trade some flies, tell him what's biting, or more likely what their not biting on, etc. But I'd be pretty nervous if he wanted to actually follow me and fish with me. Sad to say, but in this day of age you never know what someone is going to do or what their motives are.
PA is correct though. Asking to meet up with someone from the board is perfectly fine.