The sea-kayaking, the fooat and the Salmon Creek Salmon bake are all operated by Alaska Travel Adventures. The tram is owned by Goldbelt. You can just walk up and buy a tram ticket, any of the vendor booths will sell you salmon bake tickets, the float trip is no great shakes and you need to book the sea-kayaking in advance if you want to go.
Also one idiosyncracy about Juneau weather. Because of the mountains and the glacier we have a number of different weather zones, I live out near the glacier (about 13 miles out) I pass through as many as nine different weather zones coming downtown. Sooo, the weather you observe getting off the ship may not be the weather at the sea-kayaking or salmon bake. (One advantage of Thane Ore House is you can eat indoors, Salmon Creek has shelters but you are outrside.
Having said that in Juneau it's always safe to be prepared for rain. We are a rain forest.
Becky Bear
http://www.Alaskapersonaltours.com