Manor is a huge department store near Cornavin. It has a wonderful food department - akin to M&S or higher quality. The entire floor is taken up with deli counters and wonderful fresh food.
The bakery section is particularly good and you can also watch them make enormous ciabatta sandwiches (1m x 2m) that they then cut up, or roll out croissants to bake on the premises.
If you also go upstairs there is a wonderful cafe/restaurant in a self-service canteen style which is a great place to have breakfast (try the Birchermeusli), lunch (the fried fish is yummy) or tea (coffee and cakes...mmmm). The food is all prepared in front of you, and often cooked for you, but the price is very reasonable, and if you are lucky you can get a seat with a great view across the rooftops to the Saleve.
And then you can do shopping on three more floors filled with everything from beauty products and clothes to electrical items.
Rue de Chantepoulet
A lido jutting out into the lake. Perfect when Geneva is hot and you are feeling envious of the ducks paddling around - you can join them. Entry is super cheap, there is a good cafe serving substantial salads and terrines and showers/ loos/ changing rooms. There are different sectioned off swimming areas, some deeper, some shallower (and with a pebbly beach for little ones). Super relaxing and quite fun to be bobbing around next to a family of ducks. It's open from early til 8pm and they also have a hammam and massage facilities (but think hammam is currently being refurbished and you definitely need to book for massages).
Quai du Mont-Blanc 30
For the tyke with a sensitive palate, now the £ looks down disdainfully on the Swiss Franc, it's worth a visit to Rolle, in the Canton of Vaud, about 25 kms from Geneva. Filets de perche, an amazingly delicate fish, from the Lake Leman (fifty yards away), where they have their own fisherman. Drink their own wine from the local vineyard. Perfect chips
For the Cafe du Port, take the Route du Lac for 25 kilometres, from Geneva Airport. At the entry to Rolle, follow the sign that says "Port". Booking essential
Tel: 00 41 21 825 15 20
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