I bet ya GF stops fishing w/ you after you get married, Mike/luds48.
My wife us to fish w/ me a little, but hardly ever wants to go - especially late at nite.
Now my older sister use to do all kinds of sports & fish w/ her boyfriend and after they got married she stopped doing all those things. It is a pattern!
Your GF needs to understand that it is your way of relaxing/meditation and that she had to accept it. If she can't then you have to decide what is more important.
My wife knew upfront that I liked to do a lot of outdoor activities before we were married and never gave me gried about going out. She had her own hobbies as well.
Now over time (more aging of body) I don't do a lot of things now just because I kind of grew out of them. When we were married w/out a child it was a lot easier to skip having dinner together so I could go play tennis, hunt or fish. Once you have kids it chances everything! Kids require a lot of your time whether you like it or not.
Now a days, I rather get some sleep than pound the sand. Sometimes I just don't get motived to go out on my own - at least if I am heading out with some one else then I know I will go out and not sleep in.
Life = it is ALL about balance!