Saw a handful of great concerts at Jannus Landing (Now
Jannus Live) back in the late 80s. Pretty unique courtyard venue and probably worth a bookmark for you. It says they've recently given it a major overhaul though, so I fear for the singularity and charm that it once had.
Don't know that your time off will allow enough time, or how much of it is still there, but a trip out to
Egmont Key is well worth the journey. The site says accessible only by private boat, which was the case when we used to visit by sailboat, but I believe there is now a public ferry.