Your DH wouldn't be doing his job if he didn't worry. Remind him how proud of you he will be when you come back all in one intact piece, having conquered your (and his) fears. Enjoy your trip.

My DH is concerned about my upcoming trip, but he gave up long ago on discouraging my wild schemes. It's my mother that I don't quite have the courage to tell about my summer plans. I'd rather deal with the traffic and bears in Yellowstone than her reaction, coward that I am.