Beautiful, quiet island setting.
Hotel itself is modern, plain but pleasant (rooms very clean and functional). There are no private gardens or pool, but there is a small front lawned area (directly by the pavement) with sun loungers. This is directly overlooking the harbour. The restaurant also overlooks the harbour at the front, outside, and is a charming setting. Breakfast is a very decent buffet. As an evening restaurant it's fine, not special. Other restaurants, seconds away, are better in the evening. You can hire kayaks and bicycles at the hotel.
There's a man-made pebble beach a 10 minute wander away. The harbour has about 8 restaurants, one bar and a couple of small shops. The rest of Sipan is residential and churches. It's all very quiet, very small and charming. Food isn't cheap, as tourists are a captive market (approx £25-£30 per head for 2 courses plus one or two drinks). Fresh fish is best and caught daily.
Sudurad is even smaller and an hour's walk away. There is an early ferry from Sipan to Dubrovnik (around 6.30/6.50am, changing on different days) and an evening one (around 7pm) back. Otherwise, there are more regular ferries to and from Sudurad and a local bus which shuttles between Sipan and Sudurad and takes 10 minutes (though doesn't always coincide with ferry times).