Help finding luxury resort for “short” stay

My fiancé and I decided to defer our honeymoon to December or January of next year. We only want to do 4-5 nights. We have a budget of about 12k. We are based in the west coast. We really want to go somewhere adult only or isn’t known to have a bunch of kiddos running around.

I really love the idea of the butler service that Sandals has to offer!

Since this is my first time out of the country, I want to make sure we go somewhere very nice. I’ve thought Bora Bora, St Lucia, the FS Anguilla looks nice. Basically beachy, tropical, would be ideal.