Fitness adventure in Nicaragua - and question for solopreneurs

Hi Biznikians I'm a newbie here. I'm an instructor of the Nia Fitness Technique, and am planning a super fun group trip to San Juan del Sur in March 2009. We'll be dancing, doing yoga, surfing, relaxing, canopy zip-lining etc. Please see my site www.niawave.blogspot.com and consider joining us!

A question for you fellow entrepreneurs: this is the first group travel package I've put together. I'm not a tour operator. I'm a super honest person, but what would make strangers feel comfortable sending me money for this trip? And what's the best way to protect myself in the process of collecting the payments? Thanks! (PS to all you Seattle members, I grew up in Issaquah and Bellevue. It's nice to be connected to "home" through this network)