Not many have heard of Saba, but this tiny little island is a must see. All trips to Saba connect in St. Maarten so you will need to catch a flight St. Maarten's Princess Juliana International Airport (SXM). Once you land there, you can catch a small plane (via Windward Islands Airways) or ferry to Saba.
Never knew about this place before so I had to look it up. Saba is located between St Kitts and St Barts, and no wonder I never saw it before because it is quite literary microscopic. Looks like Saba is mostly for diving and hiking. Not much more to do there.