12/16-12/21 would definitely be less crowded than between Christmas and NYE. That last week of December might well be the most crowded week of the year. I also think your week might be less crowded than most of the summer, since most school kids are still in school in your week.
Be mindful, though, that weather is totally unpredictable in that week. You could have gorgeous days with the highs in the 60's and sunny, or it could be windy, cloudy and highs in the 40's that time of year. Pack a little bit of everything, maybe even a bathing suit for the heated pools, if you dare.