We spent four nights on St. Barths in June of this year. We don't speak a lick of French and felt just fine and perfectly comfortable. Rather than repeat a lot of stuff here, I will refer you to our web site where we outlined a lot of what we did there and where we ate. Take a look at http://www.nwlink.com/~lshaw/Carib2000/Stbarth.htm
We really enjoyed our stay on St. Barths, though we still like St. Martin better and own three weeks of time share on SXM.