Hello! It's great to hear that you're planning a trip to Argentina, encompassing Mendoza, San Juan, and La Rioja. Here are some useful travel tips for your journey.

Best Time to Visit:
The best time to visit these Argentine cities would be during the peak season (December to March) when the weather is warm and inviting. In particular, March is also when the grape harvest takes place in Mendoza, making it the best time for wine lovers!

Route and Accessibility:
You can reach Mendoza, your first stop, via an international flight to Buenos Aires, followed by a domestic flight to Mendoza. For subsequent cities, you can take local buses or book car rentals. All three cities are well connected with good road networks.

Accommodation and Booking:
A range of accommodations is available in all three cities, encompassing luxury resorts, mid-range hotels, and budget hostels. Booking online ahead of your travel dates is recommended to ensure the best prices and availability.

Clothing and Essentials:
Lightweight and breathable clothing is recommended for the day, with a warmer layer for cooler evenings. A good quality sunscreen, hats, comfortable walking shoes and a refillable water bottle are essential. Don't forget your swimsuit if you plan to try thermal baths in Mendoza!

Health and Safety:
Generally, Argentina is safe for travel. Make sure you have comprehensive travel insurance that covers any medical expenses or unexpected changes to your plans. Remember to stay hydrated and be cautious of your belongings at all times, as petty theft can occur.

Local Etiquette and Respect:
Argentinians are warm and friendly. When greeting, it's customary to give a single kiss on the cheek. Also, be respectful of the siesta time, typically from 1pm to 4pm, when many establishments may be closed.