Some people refer to these coastals as 1-3 day "Booze Cruises" and I'm here to debunk that. Here's my recap (long overdue) of my Westerdam 1 day and if you have any Q's, PLEASE email me. I'll be happy to answer.
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I've been on 2 1-Day coastals and have a 1 day and 2 3-day cruises set for this year. I not only think they're a blast but would hope that the fact I'm going on 5 within 2 years gives you some kind of idea.