Well this is an easy one, I live in the french riviera and unfortunately cannot recommend a good thai restaurant, I have been here for four years now but the chinese/thai food is done to the french taste and is not nearly the same as in the UK.
Here are 3 thai restaurants..
270, Route Bord de Mer, Villeneuve Loubet - 04 92 13 26 04
21, Avenue Gén Maizière, Antibes Juan les Pins - 04 93 34 21 79
25 B, Promenade Anglais, Nice - 04 93 87 14 27
Oh infact I have done one better than that, if you need information you are likely to find it on angloinfo (riviera) . I have just gone to their site for you and looked for asian restaurants I will copy the link :
http://riviera.angloinfo.com/af/263/riviera-asian-restaurants.html
good luck and bon app =)