Taku Glacier is not just the biggest glacier in Juneau, but also the only one that’s advancing. A waterjet-powered catamaran will speed you out of Juneau to meet your hovercraft. The eight-person hovercraft is necessary because the glacier is set amid shallow waters and shifting sandbars. Once at Taku Glacier, explore the alien landscape while your guide explains the ecological ramifications of its rare advance. On the return journey, enjoy snacks while keeping watch for whales, eagles and sea lions.