Seattle/vancouver/victoria

It might not be on everyone's to-do list, but we found the Boeing factory tour fascinating (North of Seattle).

I'm not sure what you mean by unconventional, but the best honeymoon activities are things you like to do on any vacation. Do you like hiking, museums, gardens, shopping, seeking out new food/interesting restaurants, city tours, history excursions, sporting events, etc.? Pick a couple activities you like and then research your options in each of those cities. All of those are really fun cities with TONS of vacation options.

Ah, OK. I definitely don't think there is only one kind of honeymoon. Any trip you two take together to celebrate being married counts! And by the way, I live in Seattle and I highly recommend fitting some ferry travel into your trip. Water is the focus here and it's fun to make the most of it. See trees, mountains, wildlife, and eat lots of PNW seafood and produce, and you will be winning.