Spotting at Nice
Goodafternoon,
I was there a few years ago and if you go for good photo locations, don't think of having a lot of fun. All places can be reached by foot but walking in a carpark can get attention and very quick "sécurité aéroport" comes around and ask you to leave this area. As far for other photograph-locations, there is a place called "CAP 3000" and from there you can admire landings in the late afternoon (after 3pm) but you'll need a lot of mm's (minimum 300mm !). In my opinion, one of the less attractive airports for spotting.
Greetings, Karl