Our daughters did a tandem at Sammy Duvalls a few years ago. Although we did not do the parasailing ourselves we were allowed to sit in the boat. There's no need to wear a swimming costume as you don't go in the water, well not intentionally you don't. Just take off your shoes and socks and off you go.

I have written an article about it for the Orlando Guide. If you click this link you will be able to read it.
http://www.onlinefloridavillas.com/o...n-florida.aspx