My husband and I just booked an Alaskan cruise on Regent Seven Seas Mariner. Leaving Vancouver mid July for one week. Ports are Ketchikan, Juneau, Skagway, Sitka. We're having trouble choosing excursions. Some are included and some have additional costs. We are not interested in city tours or food fests. We want to see the "wow" of Alaska. What is the "must do" in each port? Where should we pay more for a helicopter or flightseeing excursion? When is sea kayaking or canoeing the best way? Although we are in good physical condition, we have bad backs, so we can canoe and kayak, just not in bumpy waters. Thanks for any and all thoughts.