Zipgliding in Kauai? Pricey-is it worth it?

Also, I am 61 ( in fairly good shape ), but y'know, I have my aches and pains after strenuous activity. Furthermore, part of the experience is to hold onto a bar ( very short time), and then you let go into swimming hole. Here's the REAL thing I am worried about (lol) is that I wear a hearing aid. I can't hear s... without it and it can't get wet. And I need to wear it while zipgliding. AGH! What's a hearing impaired, older woman to do? THANKS!