Hello! Excited to hear about your upcoming journey to Argentina, encompassing the delights of Mar Del Plata, Buenos Aires, Mendoza. I'm happy to assist you with some travel tips.

Best Time to Visit:
The best time to visit these Argentine locations is between March and May (fall) or between September and November (spring) when the weather is pleasant and tourist crowds are manageable.

Route and Accessibility:
Begin your journey from Buenos Aires as it has international air connectivity. From Buenos Aires, it's an easy five-hour bus journey or short flight to Mar Del Plata. From there, you can take a flight or a long-distance bus to Mendoza.

Accommodation and Booking:
Accommodation options are plentiful in these cities ranging from luxury hotels to budget hostels. Booking in advance is always a good idea, especially during peak tourist season.

Clothing and Essentials:
Pack lightweight clothing for the day, but also some warm layers for the cooler nights. Sunscreen, a good pair of sunglasses, comfortable walking shoes, and a hat for sun protection are also recommended.

Health and Safety:
Carry sufficient medical supplies if you have a specific condition. Tap water is safe to drink in urban areas, but bottled water is recommended in rural areas. Be cautious of your personal belongings in crowded areas.

Local Etiquette and Respect:
Argentines are warm and friendly. Respect local traditions, try to learn a few phrases in Spanish, don't criticize football or their country, and keep in mind that dinner often starts late.