Sunfish are fun platforms to learn basics on for adults and kids. Yes, you will get wet but that is part of the fun.
If this boat is already at a lake, throw it in the water and see if it floats. If it does just buy it and get on with it. You should have no problem selling it if you don't enjoy it. You yourself have said you have missed buying because the boats were sold too fast for you. Could it be you are just kicking tires at the moment?