If your trip to Rennes is all booked but your itinerary is a bit on the empty side, let us give you a few hints and tips.Parliament of Brittany and Thabor Botanic Gardens are awesome attractions that all serious sightseers should make time to explore. Plan a route and enjoy exploring each one.Plan a stop at Rennes Cathedral. It's one attraction you'll usually find on most travelers' to-do lists. Place de la Gare and Le Liberte are also not far away and worth taking the time to see.