We love spending a few days in St. John. Francis and Maho are great places to stay. We stay at Caneel near honeymoon beach often. Most of the time it has been fine. Over Christmas it was rolling but it has never been terrible. People scared me away by saying it was very rolly. The ferry ways were the most noticeable. We are on a Cat though. I would highly recommend if the conditions are mild. I am sensitive to seasickness and we've been overnighted many times this year and haven't had a problem. Knock on wood I'll be there this weekend.