Visited an island near my hometown. It’s not much of a tourist spot so there was only one hotel. We stayed overnight and had dinner and breakfast the next morning in the hotel. While on the boat on the way back to the mainland, I was feeling a little weird already. I thought I was just getting seasick so I brushed it off. When we got back, that’s where I started puking and shitting alternately for the entire day, had a fever, and wasn’t feeling good for the next 3 days. I don’t even remember what we ate anymore, but that was definitely the worst.