The Kyles of Bute are the narrow channels which separate the Isle of Bute from the mainland. They are a very long way from the open sea and generally tidal streams in the Firth of Clyde are weak but the spring tide runs through the Kyles at up to 3 knots. The "lighthouse" is the An Caladh beacon which is actually lightless. If you do not have time to paddle to Bute from the Ayrshire coast, there is a perfectly good Calmac ferry from Wemyss Bay to Rothesay. Tomorrow is Christmas Eve but it is also a spring tide.......