As visitors walk between Pulteney Park and Trinity Church on South Main Street in Geneva, they will meet local "residents" and hear stories about the city's past. The program begins at The Presbyterian Church at 24 Park Place. From the church, participants will be led on a walking tour of South Main Street.    Tours will leave the church every 30 minutes.  The first tour is 6:30  pm and the last tour is 8:30 pm.   Reservations are strongly encouraged for all tours as space is limited. Tickets are $10 for adults and $5 for students, grade school through college level. Refreshments will be available in the Fellowship Hall at the Church.  For more information or to make a reservation, call the Geneva Historical Society at 315-789-5151.