I highly recommend the special offer "Weekend in the Loire Valley" (http://grand-hotel-tours.com/week-end-en-touraine/) by the Grand Hotel de Tours! It includes 1 or 2 nights in a double room, breakfast buffet and the choice of visiting the Castle "Chenonceau" or the Gardens "Villandry" or the last home of Leonardo da Vinci "Le Clos Luce."
The moment I saw the Gardens "Villandry", I thought of them as lover's bowers. It left me and my boyfriend an unforgettable romantic memory. And being able to personally visit the last home of my idol was also exciting!
Last but not the least, its price as 57 € per person / night is quite fair and would not be a burden of your short trip.