['I am going bungee jumping next weekend.  I am pretty nervous and do not know what to expect.', "Whew, you're braver than I am.", 'Or stupider.  I am not entirely sure.  I certainly do not feel brave about it.']
I hope it all goes okay for you. Trust your instincts about doing it or not.
I am going bungee jumping for the first time next week and I am very nervous