You will be in between two of the best big crappie lakes in the nation. Having a boat doesn't necessarily help in your pursuit of some of those slabs, unless it's set up to troll or tight line for crappie. I would consider traveling across lake Marion and fish Wyboo or Potato creeks. Even if his boats not set up properly, you could still drift fish minnows over spawning flats and catch a few pigs. Going into lake Moultrie, out in front on Angels landing can be a big fish mecca at times. It would be a lot closer boat ride, and can be great fishing if they are in there. Good Luck!