To get your idea off the ground, you might consider partnering with tour operators (aka tour guides) that maintain expertise in their individual adventures. That way, at the beginning, you leave the "guiding" up to the experts while you work to measure demand, create a brand and iterate on the value proposition. By handing off the actual "guiding", you can focus on developing the business. Also, I think this method demands less startup capital and/or licenses. While vayable.com does this for small (relative to your past trips) experiences, perhaps a market exists for the grand adventures? Your expertise would be useful in identifying exactly what people want/need when pursuing this type of adventure, then finding a way to deliver just that. Best of luck!