I strongly suggest pigging out on raclette at dinner. All you can eat makes it even better, too! Your hotel can suggest a few options.
See
www.lohri.ch/grafik/Raclette.JPG
MANY/MOST restaurants will be closed on a Sunday night. The workers want their time off, too.
I didn't think that TA (Taca Airline) flew to GVA. Who knew?