Many of Loch Lomond’s 37 islands are privately owned, and, rather quaintly, an old wooden mail-boat still delivers post to four of them. It’s possible to join the mail-boat cruise, which is run by MacFarlane & Son from the jetty at Balmaha. In summer the timetable allows a one-hour stop on Inchmurrin Island, the largest and most southerly of the islands inhabited by just ten permanent residents; if you’re looking for an island to explore, however, a better bet is Inchailloch, the closest to Balmaha. Owned by Scottish Natural Heritage, it has a two-mile, signposted nature trail. You can row here yourself using a boat hired from MacFarlane & Son, or use their on-demand ferry service.