TA, Expedia, and all of the other OTA’s are currently at war with Google now becoming a tour search engine too, so re: ppc, it’s getting pretty cut throat and driving up keyword bids massively in some instances. Since Google My Biz tour company listings started offering the “book now” button right off the search page, eliminating the need for users to click through to a site, it’s been a massive shift. From a very general standpoint, I’d then say in your case to aim for in destination geo, bid on your own name to push the OTA’s down for sure, and focus on terms that they have you listed. How do they differentiate you from competitors? How do they positon you? Use those terms, then go exact match or broad match + Good luck!