We are flying into Milan and then want to do the northern Italian riviera and then go into France as far as Nice. We are hoping to do some side trips north of the riviera into area like Eze, St. Paul de Vence, Peillon, and Roquebrune-Cap-Martin. Do you think we would do better with a car or are the trains/bus frequent & easy enough? We will be going the first week of June. Thanks!