If you look at current stats for tourists and travellers, they want fast, technical experiences. Over 60 - 70% want instant bookings by looking on their mobile and getting the confirmation they need. You will attract more individuals by giving them the user experience they are looking for.

With resorts who want to book themselves, you will want to look at putting together a contract deal that compromises for both sides, such as you calling in the bookings once they are made. They may want to do the bookings themselves, but remember, you are also marketing and showcasing them on your site so it should give you plenty to leverage with.