^ Agree. Please don't let us make you think you won't see some great shit. St. Maarten is fucking amazing. Be sure to rent a car so you can explore. And you better explore. There are all sorts of "remote" beaches where there are few if any people there. We found one beach where it may have been a gay nude beach (lol) but they had some guy cooking fresh food, and you ate on crappy little tables, it was a blast. And we found one beach on the north side of the island, very remote, but beautiful. Along the French side there's all sorts of great little places to stop and get out and go in the water. There was one where there was a tiny little island (like 75 sq ft) about 100 feet out in knee deep water. We just walked over to it. Your own (rocky) island. They have plenty of activities. One thing you can do is rent these wave-runner things and take them out and then go snorkeling. If you SCUBA dive, you can do that, but I never saw any good reefs there. Supposedly Saba is the best for reefs (I think it was Jacques Cousteau's favorite island?). There are plenty of good places to eat in Simpson Bay. Again, if you park somewhere at night, just keep your wits about you while walking into establishments. I'd stay out of most of the night clubs unless you're just dying for it. There's plenty of restaurants and other crap you can go to without going to the clubs. Again, I'd recc the Cliff Bar if it's still open, which is a little bar that is literally hanging off a cliff (you look down, and there's a beach below you, but you're on a cliff.) It's in Maho, right by the Maho Beach Club or whatever the big white buildings are that are between the casino and the beach. There's just so many cool little places. There is one bar that's pretty fun which is a big trade ship that is permanently docked. Pretty cool to sit on it, drink beer, and just look out at the ocean.
But yeah, if you're there 10 days, you need to explore.
Anguilla: is easy to get to. There are boats right by the airport that run there, and you can just ask around. Usually the people who operate the boats have hookups with hotels on Anguilla, but I'd just stay at Ku. It's the most relaxing mother fucking place on the planet. If you're fucking rich stay at Cap Jalupa, I think it started at $575 a night (I didn't stay there, I think it's for celebrities, etc..) There's also a cheap shitty place called Arawak hotel, which is old school, but still awesome. You can rent a car, and you have to "buy" a British driver's license ($15 or so), and drive on the opposite side of the street, which is weird. Anguilla is so bizarre, because you can be driving and you'll be the only person on the entire road. Besides the most beautiful beaches (and every time you come over a hill, you'll pull over because it's the most beautiful thing you've ever seen), there are a handful of things to do on the island. One is the dolphin swimming. You can swim with them, they'll put their noses against your feet and push you up out of the water, etc. Food can be hard to come by at night time, with most places not being really well advertised, but you'll find something. And of course your hotel has food. There's no casinos or real night life there, but I guess there may be some clubs, I don't know. I didn't see any. That's not what you go to Anguilla for. You go to eat dinner on a quiet beach and play with the coconut retrievers (island dogs.) You'll remember Anguilla for the rest of your life.
Saba: The "unspoiled queen." It's an 8 minute plane flight from St. Maarten, or an hour long boat ride. The boat ride can make you feel a little shitty. Saba is an interesting, yet brutal place. As I previously said, they only came off the bartering system in the 1980s or so. It's very, very safe. There's some decent history there, but the island is basically a huge rock. Roads are steep with big dropoffs. I did not drive there. There's taxis, and basically they'll just charge you a flat rate at the end of your trip (meaning, wherever you stay on the island, not a chance walking to the water taxi without dying.) Saba has one seasonal beach that is like 30 feet long, unless they've built something in recent years. Saba has a neat eco lodge. Honestly Saba's cool and all, but it'd be last on my list of things to ever go see again.