Luxury Cambodia Voyages

Cambodia's Koh Rong has no cruise pier, which is precisely why SeaDream III shines here, anchoring off powder-white sands few large ships can reach. Snorkel over coral straight from the swim platform, hike jungle trails to your own empty cove, then return after dark for the island's real magic: waters that glow with bioluminescent plankton at every stroke. This is castaway luxury of the rarest kind, gloriously remote and utterly uncrowded. Swimming and non-motorised craft only here; motorised watersports need the local authority's permission.

The seaway's first stretch out of Montreal locks the ship up and over the Lachine Rapids, a natural barrier that stopped explorers for centuries before modern engineering solved it in the 1950s. Farmland and small river towns line the banks as the St Lawrence narrows, while ospreys and herons work the shallows on either side. A gentle, historic introduction to one of the great engineering achievements of the 20th century.