Hello! It sounds like you have an amazing French trip in the planning. I'd be delighted to provide you with some travel tips.

Best Time to Visit:
The best time to visit France is typically during spring (April to June) or fall (September to November). Summer can be quite hot and crowded, especially in Paris, so consider that when planning your travel dates.

Route and Accessibility:
Flights to Paris are frequent from around the world. From Paris, you can take a high-speed TGV train to Bordeaux, which is a roughly 2-hour journey. Nice is another 4.5 hours by TGV from Bordeaux. French rail is widely known for its punctuality and comfort.

Accommodation and Booking:
All three cities offer a wide range of accommodation, from premium hotels to budget hostels. Use booking sites like Booking.com or Airbnb to find the right option for you. Early booking is always recommended, especially during peak seasons.

Clothing and Essentials:
Spring and fall in France typically require a mix of light and warm clothing, as temperatures can vary. Don't forget comfortable shoes for walking. Carrying a universal power adapter, your essential toiletries, and a copy of your travel documents can always come handy.

Health and Safety:
France is generally safe for travellers. However, always take common-sense precautions against petty crime like pickpocketing, especially in crowded public places. If you're from a non-EU country, consider getting a health insurance as healthcare can be expensive.

Local Etiquette and Respect:
French people appreciate politeness, so always greet shopkeepers, hotel staff, etc. A basic understanding of French phrases can also enhance your overall experience. The French are also particularly conscious about quietness, so try to keep your noise level down.