We're just back from the St Vincent & Grenadines and Grenada and can tell you that this thing is HUGE down there.
Hotel accomodation is likely to be non-existent unless it's pre booked already.
Like Waymar, I think the first hurdle is going to be trying to figure out what the H they are up to on that field - unless you're an expat Brit or Aussie
Charlestown in Nevis is a very charming spot, the best anchorage is a bit north, off Pinney's beach. At St Kitts we stayed in what appeared to be a new (in 2003) marina in Basseterre just off the Cruise ship terminal - good access to town but a bit of a bunker. The anchorage across the bay near the Customs was quite busy when we arrived.
While at Nevis there was a "regular season" cricket game - ferry loads of spectators showed up, all dresssed to the nines- even this seemed to be a major social event. The world cup will be crazy!! Enjoy!