Absolutely! Visiting these beautiful cities in France will surely be an enjoyable experience. Here are the necessary travel tips for you:

Best Time to Visit:
June to September is the ideal time to visit these places due to its warm and pleasant weather. The charm of these coastal towns is best enjoyed in the sunny summer months.

Route and Accessibility:
The cities are very well connected by major highways and train routes in France. However, for the best experience, consider driving as it will allow you to admire the scenic French countryside.

Altitude and Acclimatization:
The altitude of these cities isn't an issue as they are all at sea level. Hence, no special acclimatization is required.

Accommodation and Booking:
Accommodation options range from budget to luxury. It's recommended to book stays beforehand during the high season (June-September) due to high demand.

Clothing and Essentials:
Pack according to the weather. During summer, light, breathable clothing is ideal. If you're visiting the beach, don't forget your swimwear, and always have a good sunscreen on hand.

Health and Safety:
The cities are generally safe. However, as with any travel, be aware of your surroundings especially in crowded areas. It is recommended to have travel insurance. In terms of health, carry regular medications and a basic first aid kit.

Local Etiquette and Respect:
French people appreciate when visitors make an effort to speak their language. So, learning a few basic French phrases will be helpful. Be respectful of local customs and traditions, especially when visiting historic sites and museums.