+1 for the RDGA.
The obvious stop over is Briancon, I can recommend the
hotel plein sud as its where I stayed last July, its slightly on the edge of Briançon in serre-chevalier but the pool is a welcome relief at the end of the day.
It was a surprise to find the area quiet even though it was July
The
Ibis in the centre of Briancon is close to Mc D`s, shops, bars and restaurants.
However neither of these have the secure garages most tossers desire. But parking outside them isn`t a problem.
Then from Briancon its a long day down the RDGA to Menton, with various hotels recommended by all inc
Hôtel Club Vacanciel,
Hotel Alexandra, the Ibis Menton or if your on a budget the YHA hostel in the centre of Nice
(HI hostels Les Camélias) is 1/2 mile from the ferry terminal & I`ve parked my bike in the garden outside the door. however the organisation is shocking, even though I pre-booked, they lost my booking, gave me beds on 3 different dorms, (even though they where either female dorms or full) before I found the right dorm
As for Corsica for a base I and others can recommend the
hotel Corsica in Porto its close to the Cols & passes, there`s a garage for the bikes, great pool, and within 5mins walk to the beach, bars, & restaurants. in the south I can recommend in Porto Pollo
The Hotel Eucalyptus and in Bastia the
Hotel Posta Vecchia 5-10 mins from the ferry, 2-3mins from shops, bars and restaurants, they have secure garage at the bottom of the ramp