Jul 26, 2020 - 9:51 PM
in reply to Andycperry
OK, so you are not far from Gare Cornavin, that means you can keep it simple and take the train from Geneve Aeroport to Genève Cornavin (the main railway station).
You may want to take the 10 minute walk down to the Rhone and the start of the lake at the Pont du Mont Blanc (walk down Rue de Temple and East along Quai des Bergues) before you check out of the hotel. Or go from the hotel to the lake, then up to Cornavin station. Decathlon is in Rue de Lausanne alongside the East end of the station. Hofsterret Sports is in Rue de la Corraterie, south of your hotel. There is an 'MM' (ie large) MIgros in the same complex as the Decathlon.
The trains to Sion from Cornavin leave at . Get the faster train. Also (ideally) get your picnic food from the Migros in Cornavin station.