GROUPS: If there are more than 15 people in your party, inquire at least one week in advance about special pricing. Groups (scouts, special interest, etc. ) and bus groups, please call for special pricing. Group rates must be paid in one check or in cash and only one receipt will be issued. If a credit card is used for a group tour, a 3% surcharge will be added. Whatever number of people you reserve for your group at least three days ahead of time is what you will be charged.