Jewel of the Seas is a lovely ship, but I have never liked this itinerary on Royal Caribbean. Most Alaska cruises go to 3 Alaskan ports plus a glacier. This itinerary goes only to Juneau and Skagway, but not Ketchikan. While Tracy Arm is a lovely fjord, the Sawyer glaciers at the end are much less impressive than Hubbard Glacier (on Radiance of the Seas) or Glacier Bay (on some Princess, HAL, and NCL ships). The main advantage of this itinerary over others that depart from Seattle is that it spends a full port day in Victoria, rather than the 5 or 6 hours that most cruise lines spend there in the evening.
If you want a roundtrip cruise, I suggest looking at those that sail out of Vancouver rather than Seattle - including
DCL. Sailing between Vancouver Island and the mainland (from Vancouver) is much more scenic than sailing around the west of Vancouver Island (from Seattle) in open ocean.