March can be good. Last year I caught more fish in March then I did in April. What makes Kentucky Lake nice is the large concentration of black crappie. They spawn prior to whites so we get a longer season. Back 20 or more years ago whites dominated and March for me wasn't always as good. Lots of places for you to choose from. From Sledd and Big Bear, Jonathan, Blood, Sandy, and all the LBL bays in between there is a lot of water you can fish here. I work Blood and the associated TN LBL bays more than the others but I have favorite spots and memories from one end to the other. First thing I would do is start calling around, checking availablity of rooms, and comparing. Some places rent early or are rented year to year. Especially towards the crappie spawn.
Good luck!
Old Guide
Matthew 6:34
Therefore do not worry about tomorrow, for tomorrow will worry about itself. Each day has enough trouble of its own.