Hello! That sounds like an exciting trip to Argentina's intriguing regions: Rosario, Córdoba, and Mendoza. Here are some travel tips for your journey.

Best Time to Visit:
The best time to visit these Argentine locations is during their spring (September - November) and fall (March - May), which offer mild and pleasant weather that's perfect for exploring the cities.

Route and Accessibility:
Starting from Buenos Aires, you can take a domestic flight or bus to Rosario. From Rosario, Córdoba and Mendoza are accessible via bus or plane. Car rental is another option to reach all three cities, giving you more flexibility on your journey.

Accommodation and Booking:
All three cities have numerous hotels and accommodations to choose from. It's advisable to book in advance especially during peak tourist seasons. Airbnb options are also available.

Clothing and Essentials:
Considering Argentine weather, light clothing is ideal for summer while layers are best for cooler months. Don't forget a good pair of walking shoes, sunblock, sunglasses, and a hat for sun protection.

Health and Safety:
Safe drinking water is available in these cities. Always take care of your personal belongings and stay in well-lit, populated areas during the night. No specific vaccinations are required to travel to these parts of Argentina.

Local Etiquette and Respect:
Argentines are very warm and friendly. Greeting with a kiss on the cheek is common. Tipping is customary at restaurants. Respect for local laws and customs is appreciated.