Are you offering one session on Saturday and one on Sunday? Or more? If you are offering sessions on just Saturday and/or Sunday, you can promote it as cross training boot camp to supplement an existing fitness program. You can also use it as an add on for your fitness programs, discount it for participants that you are working with already or as an incentive to work with you privately.
As to cost, it really depends on your market. But you can also start a bit lower (giving clients that sign up right away a low rate for 6 months or so) and then increase the price when you are making a decent amout on each session for new students. The entry price students know up front that the rate will rise at the end of the first six months, so you won’t be surprising them with an increase later. If I were just starting out on my own, I would charge $5 per session for the people that sign up in the first 2 weeks or so, and then have the rate go up to $8 or $10 per session after the initial sign up period.
I wish you great success. Check out my website sometime if you get the chance. You never know when you might be coming to the Big Island and want to network or take some CECs to write off a sweet vacation. www.hawaiifitnessacademy.com