One Comfortable Day in Tignes for Seniors — need month to finalize

I'll prepare a single-day, accessibility-focused itinerary in Tignes tailored for seniors (short walks, frequent rests, calm dining, step-free options). Before I create the full day plan I need to know which month (or season) you plan to travel so I can adapt to weather, daylight and seasonal services (lifts, lake activities, summer walking paths vs winter snow-accessible options). Please tell me: