Last summer, I dropped by Annecy on my way from Lyon to Geneva. This place was mentioned many times by locals when I stayed in Lyon. When they talked about Annecy, I could see excited glow on their faces: indeed, if you understand southern French’s idyllic fantasy, Annecy is the right place with no doubt.
If you decide to depart from Lyon, trains and buses are both available. Personally I would suggest you to try the Blablacar(https://www.covoiturage.fr). It’s the most popular and trusted ridesharing website in France, the bonus is you could make friends and understand more about your destinations when sharing the journey with friendly local people. One hour drive, 5 euro costs, I cannot ask for more 🙂
I just spent a day here ,so I didn’t explore much about this place. But if you are also with a tight schedule, the Lake Annecy would be very nice for a one-day trip. Walk along the lake and the river, have some seafood in the restaurants… If you want a better view of the landscape, renting a boat and relaxing on the lake would be perfect.
Also, the Annecy Castle and Palais de l’Isle are famous sights for those who wanna explore more. (@Fashionmimo)