Islay, "Queen of the Hebrides" is around 20 miles by 20 miles. It has nine distilleries , Bunnabhain, Bruichladdich, Bowmore, Coal Ila, Ardbeg, Laphroaig, Port Ellen, Lagavullan and the new Kilchoman distillery. All are worth a visit.
The Islay has two ferry ports , the ferry journey is a 1 hour 40 mins trip from the mainland, it leaves from Kennacraig, near Tarbert on the Mull of Kintyre, which is about 2 and half hours from Glasgow by car.
British Airways also runs two return flights per day between Glasgow international airport and Islay airport.
Take a distillery tour. Even if you don't like whisky it's really interesting to learn about the distilling process and see how the distilleries have shaped island life. If you do like whisky you generally get a free taster. The main tours are available at Bowmore and Ardbeg distilleries where there are visitors centres and dedicate tour guides, though it may be possible to tour other distilleries by appointment.
Use the swimming pool, sauna and gym at the McTaggart leisure centre in Bowmore.
The cafe at Ardbeg distillery is wonderfully rustic with some great menu choices including good soups and home baking.
Islay is a pretty safe place and any crime here is likely to be big news.