Hello! That sounds like an exciting plan. Here are some tips for your visit to Mar Del Plata, Bahía Blanca, Puerto Madryn.

Best Time to Visit:
The best time to visit these cities in Argentina is during the spring and autumn, specifically from September to November and from March to May, when the weather is pleasant and mild.

Route and Accessibility:
These cities are well connected to each other and the rest of Argentina by bus and air routes. For Mar De Plata, the Ministro Pistarini International Airport (Ezeiza) is the nearest major airport. Buenos Aires has regular bus services to Mar Del Plata. For Bahía Blanca, you can use Comandante Espora Airport. Puerto Madryn has El Tehuelche Airport.

Accommodation and Booking:
These cities offer a varied range of accommodations suitable for all budgets. You can find luxury resorts, mid-range hotels, and budget accommodations. It is recommended to book your accommodation in advance, especially during the peak season.

Clothing and Essentials:
Layered clothing is recommended as temperatures can vary throughout the day. Carry a mix of light clothes and warm clothes. Sunglasses, hats, and sunscreen are essential due to the often intense sun.

Health and Safety:
Argentina is generally safe for travel. But as with any travel, maintain punctiliousness with personal belongings. Tap water is generally safe to drink, but bottled water is recommended. Make sure you are up-to-date with routine vaccines.

Local Etiquette and Respect:
Argentinians are known for their warmth and friendliness. A handshake and a nod are common greetings. Knowledge of basic Spanish can be helpful as English is not widely spoken.