-A high-quality folding knife with a fid built in (Myerchin makes a nice one)
-Good flashlight, LED preferrably (Streamlight is a good make)
-a hand-held depth-finder $100 at West Marine
. Great for finding suitable passes in shallow water
, sorting out an anchorage to see if you can swing without hitting, helping others to tie up at shallow docks, etc...all scenarios a cruiser will see eventually.
-an electronic barometer/ weather station. Oregon
Scientific does a nice one...
My vote, go for the knife. Can never have too many on board.