Flight
Geneva, Switzerland is the closest airport to Lausanne, 45 minute train ride. There is a machine for buying train tickets in the baggage claim area, so you can do it while you wait for your luggage. Of course, you can fly into any major airport and explore a major city before heading to Lausanne. You can fly to Paris, France (3.45 hours away), or Milan, Italy (3-4 hours), etc. and then hop on a train to Lausanne for a pre-wedding vacation. Take advantage of the train system in Europe and have a vacation if you can!
Hotel
Great location, close to restaurants and the cathedral.
Hotel
Great location and close to the cathedral and restaurants.
Hotel
If you want to spoil yourself, this is the place. $$$
Hotel
Youth hostel in Old Town location.