To be honest, pre-fishing hasn't really paid off for me. With my luck, every time I prefish and have pre-conceived notions on the lake -- come tournament day and EVERYTHING is completely different lol.
If I get a chance to go out on the lake, I like to just idle around now and understand the structure of the lake.
I'm kinda excited for the first tourney on Menomin though... can't wait to get my ass handed to me.