We visited the San Gimignano 1300 without doing the treasure hunt and still found the miniature model fascinating. It's fun to get up close and test out different angles with a camera. Also the employees were more than willing to stand with us and answer our questions (they spoke English, Italian and French) about the history and the 72 towers that used to stand in the city. We didn't sign up for the tour, but left a donation since this visit was included in the complete Civic Museum visit ticket (only €7.50) which gives you access to up to five different munipal museums, including the Big Tower (Torre Grossa).
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.