I think that children have to be 6 years and older to go on the treks but they do run short pony rides for the under 5's. They also run hay rides which are perfect for families with young children. There were 8 people in our family and we were split into 2 separate treks. I'm not sure how many people are in each trek usually but there seemed to be a few couples waiting. They are very accommodating and helpful if you want to chat with them. The website is also quite informative.