Arrived at a small pier not very far from my house today to fly my H. There was a family there in a camper van so I asked the Dad if he had any objections to me flying and he said no. So I had 2 batteries charged. Done a great flight and landed. Put in the second battery and took off again. About half way through the flight the small are started to get a bit busy so I decided to terminate the flight early as it looked like they were going swimming and I didn't want ti get called a peeping tom. While my take off point was well clear I was bringing the H back in to land and recover. I was about 15 mts to land and this guy and I assume his daughter arrive in on bikes. Standing well clear and behind, they stopped. Looked up at drone, seeing it coming into land, walked around me and under it with their bikes. I quickly aborted the landing, gained altitude and selected an alternative less appropriate landing spot as it was slightly sloped. Always be aware of your surroundings and the fact that an area can go from quiet to very busy in a heartbeat.