I have only had my 1978, 33', for a little over a year, but I have done a lot to it so far, and have been in almost every nook and cranny accessable.
Some of the things I have done is build a new companionway door and hatch that double lock from inside (dead bolts) and outside (keyed tumbler locks), refinished the wood and walls in the head, new toilet, completely removed two refer units and the compressor that were where the quarter berth should be, rebuilt the quarter berth, replaced hatch gaskets, some ports (still one to go).
Currently I am running a new mainsail halyard back to the cockpit with a new (to me, eBay) Lewmar #10 winch, refinishing exterior wood, adding GPS, VHF and depth finder to pedestal, new salon and quarter berth cushions, new carpet on all bulkheads.
Things left to finance are new sole, bottom job, exterior paint.
We love sailing in the Florida Keys and pray the oil stays away.