Our granddaughters ages 13 and 15 declared this their favorite experience in Alaska- they saw orcas, humpbacks, otters, mountain goats, sea lions, seals, puffins, etc. It's our second time, and hope to repeat it with other grandkids. Don't let the weather deter you. If it says "rain" that day, it may turn out to be the best day for watching wildlife. "Rain" might mean the waves are calm, so no nausea, and you can get really close to Cataract Cove so that you almost touch the cliff. It can be rainy and still have excellent visibility. Overcast skies means the glaciers will appear even more blue. Hope you get Captain Mark Lindstrom, who gives an excellent narrative about what you are seeing.