I have done the lunch cruise on The Passaat the past 3 years. We have not had anyone get sick in any fashion and it is something we look forward to doing again. I have not done the sunset cruise so I can not speak for the snacks. When you communicate with Mirian, ask about snacks. Dress is whatever you want to wear.

July is not a busy time but I would suggest emailing Mirian at least 2-3 weeks out. They only take around 20 or so people so it is not at all crowded.

If you are at Royal Palm you can just walk across the street to catch the dingy at your assigned time.