Two good places to eat in Loches are Le p'tit restau in the center of Loches and Trattoria Mauvieres, good pizza in a troglo on the south side of town. Nearby Azay sur Indre (note--don't confuse this little village with Azay le Rideau, which has a famous chateau) has a really good prix fixe lunch at Le relais d'Azay. though you must reserve a day ahead or better two or three days ahead. It's super popular.
When you're in Loches, if you visit the municipal garden you'll have a wonderful view from there across the river to the historic buildings on top of the hill. The Saturday market is great, though so popular that it's hard to find parking.
Not to be missed during spring through fall is beautiful Chedigny, the village of roses. It's maybe a 20 minute drive from Loches. It was the first village in France to be named a Jardin remarquable because its streets are lined with roses, wisteria, and other beautiful perennial flowers. I say "streets" but there's really only one longish one and one short one. It's a small village, bit I can spend an hour there taking photos. When we arrive in the area we go there first thing, then every day as long as we're in that neck of the woods, and then one last time as we are leaving.
Chedigny has a rose festival at the end of May, but in recent years peak bloom has been happening before that. No matter what time you're there in the growing season, you'll find beauty in the streets. In addition, the Jardin de Cure behind the church (entry fee of a few euros) is worth a visit to see an old-fashioned garden of vegetables, fruit, flowers, and herbs.
Near Loches and Chedigny is the really tiny village of Chanceaux pres Loches. It's just a chateau (private), church, chalet with exterior murals, and an allee of fine old plane trees (sycamores to us).
I agree about Montresor. A wonderful village. The riverside path may be a challenge if it's been rainy.
If you have a Michelin map for the area, you'll see roads marked in green, which means they are exceptionally scenic. As if this wasn't already a very scenic part of France! IIRC, D17 which runs along the Indre river is very scenic in parts. If you follow the D17 in summer, you'll cross over many bridges with boxes of flowers.
Have a wonderful visit.