Formal nights (night 2and 6) are called dress your best. If jeans and a polo are you best then that’s it. We pack only a carry on and I always have a suit.
pools on Quantum- IDK
indoor spaces are heated, but you still my need a sweater. Like everything in Alaska - dress in layers
check the weather forecast before you leave, it can change a lot but…. Also it depends on the excursion you might be taking. Rain pants - I would never take them, but I can handle rain and a bit of cold.