Must visit
Have just come back from there last week. Are you visiting for a general holiday, or for the aviation "Must sees".
These include:
A day trip to Saba, the shortest runway in the world. Perched above cliffs, this landing is scarier than any Alton Towers ride.
A trip to St Barts for an equally adventurous landing, where the plane has to descend rapidly over a hill to reach the runway.
A visit to Maho beach at the end of the runway to watch a widebody landing. There are three hotels there - can get details if you want. Check out photos at Airliners.net.
A take-off in a widebody, where thye must bank steeply to the right in order to avoid the hill at the end.
AF still go there daily using an A340. I was already in the US, and wanted to visit Puerto Rico, so got there using local hops.
Yes, SXM is an expensive place to get to, but is a great destination for general holidays (even though it was p**ssing it down the day I was there) and plane spotters alike.
You might also want to consider flying to St Kitts (Excel weekly from LGW) or Antigua (various BA,VS & BWIA), and taking a day trip from there. It is possible (but not advisable) to do Saba & St Barths via SXM in a day from SKB, NEV, ANU etc.