Saparua is the largest and most populous of the Lease Islands just east of Ambon, the capital of Maluku province.
With its friendly population (mostly Christian), pretty villages, plentiful historical relics, good beaches and fine coral reefs, it was also the most popular island for a quick escape from Ambon before tourism in Maluku collapsed in 1999.
It is now rapidly becoming more visited again, and its once varied and pleasant beachside accommodation options and dive-shops are reopening, too.

From Saparua you could also visit the smaller and more remote neighbouring island of Nusalaut - well worth considering if you have an extra 2 days' time or so!