Yes, a surcharge is assessed for groups of up to 25 people. For example, if your group features 12 to 15 people, you will pay a 30% surcharge over the regular tour price. A group with 16 to 19 people will be assessed a 20% surcharge while groups of 20 to 25 must pay a 10% surcharge. Any group with 26 or more people will not be assessed a surcharge.