Don't know if you'd consider this, but camping on the island can be pretty cool, free, and great bank fishing. I've done it a couple of times and you can catch catfish and sandies all along the bank. You could lanch at Clearlake for a very short ride over, or at Avalon/East Fork for a little longer ride.
Other than that, if you're married to the South End I can't really suggest much except catfishing. There's not much timber for crappie to hang in.
Be careful with that size of boat and be sure to have your lights on at night. Otherwise, you could get run over.