If your boat is based out of the BVIs then the fees for checking in and out of the BVIs are minimal. Just make sure you grab a few extra customs forms when you first check in so they can fill those out on the way back before you check back in. I would also recommend making sure you have all information you need for the BVI and US forms. We have saved the info since we are down quite a bit. AYC will charge a small fee for drop offs or you can also reserve a slip for a few hours. Customs experience is night and day compared to the ferry. Just make sure you have some small bills especially if you check out of Gun Creek or Jost.