1) Parasailing is dangerous wherever you do it but manifestly safer in the Keys than
Mexico
2)
Key Largo being the most popular
SCUBA diving destination in the
USA does get its share of fatalities over the course of five years in what is overall a safe activity
3) Rob Stewart is a separate matter, reading the voluminous court filings is insightful for those who care deeply >pun<. This does not make the Keys dangerous any more than OJ Simpson makes
California dangerous
4) Highways have crashes