The Portland Attractions Marketing Alliance attraction for November was the Oregon Coast Aquarium, so our family headed for the coast. We'd been looking forward to this one all year.
Over the years, we've been to the aquarium plenty of times. My husband and I went to see Keiko, the whale from Free Willie, while he was there. The kids and I slept in the Passages of the Deep tubes one night, with sharks swimming over and below us. (For the record, I don't recommend trying that with an infant, a toddler, and two school age children. They had fun. I survived the night.)
And there have been trips just to see the seals and sea lions and sharks and jelly fish.
We enjoy our occasional visits to the aquarium, but admission for a large family isn't inexpensive. The nearby Hatfield Marine Science Center is free (with a suggested donation) and although it's not nearly as large, it does have a touch pool and the octopus is always better than the one at the big aquarium. (Although I just checked the octocam and they don't have one on display right now)