Hello! It sounds like an exciting trip to the South West of France. Bordeaux, Arcachon, Périgueux, and Agen are known for their historic and natural attractions.

Best Time to Visit:
The best time to visit these cities is from April to October, where you can enjoy a comfortable climate and numerous outdoor activities. Wine lovers may prefer to visit in September when the grape harvest takes place.

Route and Accessibility:
The best way to reach Bordeaux is through international flights. From Bordeaux, you can drive or take local trains to reach Arcachon, Agen, and Périgueux. French rail and road networks are widely accessible.

Accommodation and Booking:
From luxury hotels to budget-friendly guesthouses, you have a wide range of choices. It's advisable to book your accommodation in advance. Consider using popular booking websites like Booking.com or Airbnb.

Clothing and Essentials:
Pack comfortably for warm weather, but don't forget to bring some warmer clothing for cooler nights. Essential items include sunglasses, sunscreen, and a good walking shoes. An umbrella might be useful as sudden showers are not uncommon.

Health and Safety:
France has a high standard of health care. Tap water is safe to drink. Remember to carry any personal medication you need. Make sure to have travel insurance that covers health.

Local Etiquette and Respect:
French people appreciate politeness, so remember to greet locals with 'Bonjour' (Good Day). If you are visiting a wine estate, it's common to buy a bottle as a sign of thanks for the tour.