The Radiance class ships are very elegant and spacious. The Jewel is currently last on the list for getting the Royal Advantage upgrades installed so you'll still have the Seaview Cafe instead of Izumi, no pub, no Giovanni's Table (it is replacing Portofino, so it isn't that much of a change anyway - one Italian place for another), and some other things. These really aren't that big of a deal though as the Jewel will still offer a nice cruise.
This class of ship was built for speed and they are among the fastest cruise ships on the sea.
November is a good month for cruising from San Juan. It is likely that a good portion of the passengers will be from Puerto Rico for obvious reasons. This can often mean the ship will be buzzing with activity until the early morning hours and you won't see the decks rolled up at midnight.