Just did that sail last week from Salt Pond Bay to Chistiansted. It's a nice sail when the conditions are right. It was four hours for us (Beneteau 45) with winds of around 15 on a beam reach. The ride down was a bit lumpy but the ride up was fantastic. We pulled in to Green Cay marina which is about three miles to the east of town. We called them first to make sure they had room for us. It's a pretty good marina with showers, laundry, fuel, swimming pool, restaurant, etc. But very full - pretty sure we had the only slip available. We rented a car but the car rental places do not deliver so a taxi ride to/from town was necessary.
If you have not been to Christiansted I think you will find the down town area and water front board walk charming.
No registration/clearance needed. You are in the USVI. A visit to Buck Island requires a permit. But I'm not sure they are giving those right now (when I tried in June the park service site was not taking applications).
Anchoring in Christiansted harbor will be a bit crowded. But surely there is room for one more (?).
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