Welcome to the Riverside Park white-water rafting trip. We want you to have a safe trip, so there are a few things that you (have to / don’t have to) do. First of all, (you’d better / you shouldn’t) listen to your guide. That’s me, so please listen to me carefully. Now for the safety rules: (You must not / You must) sit on the raft at all times. Stand only when you are getting on or off the raft. And while we are riding, you (don’t have to / ought to) hold on to the raft.
It’s going to be warm today, so you (don’t have to / must) wear a coat, but you (should / shouldn’t) wear a hat. It will protect your skin and eyes from the sun. Later we’ll stop at a beach and have lunch there. (You shouldn’t / You’d better) eat on the raft. Finally, don’t forget that rafting can be dangerous. (You don’t have to / You’ve got to) be careful all day. If you follow my instructions, you’ll be safe and have fun!