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http://www.worldweather.org/062/c00902.htm

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1 - days get shorter, the temeratures are between + 18 the day over, + 5/8 in the middle of the night. It is wet-cold especially when the wind comes from the seasude. Colder when comeing down from the north, over the Alps. Nice and this part of the Riviera has a micro-climat, so it can strongly rain in Cannes, the sunshine over Nice and deep frog in Monaco in the same moment.
2 - Some peacefull excursions for example:
A full day into the Alps to Beuil, Valberg via the canyon of river Cians, back to Guillaume, Entreveaux by the canyon of river Dalius.
One more into the backland with stopps in Valbonne, Bar s/Loup, Greollieres, Gourdon and a visite of a perfum manufacture in Grasse.
Along the coast via Cannes and the pretty nice street at the coast (Coniche d'Or) to Frejus, via Bagnols en Foret to Fayence - back by Montauroux, Auribeau s/Siagne.
The near surroundings of Nice with Haut de Vagnes, St. Paul, Vence, St. Jeannet, Le Broc and back by La Roquette du Var to Nice
A side step to Italy by the motorway to San Remo, Brodighera, the principallity of Seborga, back by the very nice village of Apricale, Ventimiglia and why not the evening in Monaco.

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You can wear whatever you find comfortable but coming into late Autumn/Fall you may find walking boots or covered shoes will keep you warmer and drier.

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My parents are nearing 60, what would be the friendly options for them to visit that are not too tiring and busy (other than vineyard excursion)?

That's not old these days! I'm 59 & Mr Saikunger is 63 and we still travel as we always have done... except for one thing. We now have wheelie backpacks!

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Thank you guys for the quick reply. Oh saikunger well it's not old I know but I do get worried haha.

Any packing tips?