If you wouldn't mind, Fungirl, it'd be interesting to hear from someone who's recently been there.
I'm the type who likes to explore a bit when I'm somewhere new, and I like that these day trips are possible from St Martins to Saba, St Barths, Anguilla etc.
I can't tell with Aruba and Curacao how far they are from each other or whether a day trip is possible. Having said that it's not the end of the world to stay on one island the whole time if the island has a fair bit to offer. I guess my fear is that there wouldn't be enough on offer in Aruba. I enjoy going to the beach but I'm not the type to sit on it from sunup to sundown, I like to have diversions available. Hmm, it's very close to Venezuela...nah, that probably wouldn't be a good idea!