A quick example might be mentioning surf lovers. Gran Canaria is the place where every years in July take place the world championship of wind surf. My house is just few minutes away from a surfers' beach.
I'm a traveller myself and I enjoy to share my travel experience with others travvellers like me. I've been travelling for years and when possible, I've always preferred to stay with local people to know their culture, to feel part of them. The experience gained in years tought me how to make my guests feeling at home