The harbor gets pretty crowded on Christmas as a lot of Scandanavian boats meet up there, but it's a large harbor so you should be OK. I wouldn't count on visiting Mystique around NYE because if a lot of the owners are on island they close it down to yachts, we got burned the last 2 Xmas eves

Drink all day at home, your friends worry about you; do it on vacation and they say "what a good time you're having". Save your friends needless worry, travel more!