Hello! It sounds like you're planning a trip to Mérida, San Cristóbal, and San Antonio Del Táchira. Here's some information to help you out.

Best Time to Visit:
The best time to visit these cities in Venezuela is during the dry season, which runs from November to April. Specifically, Mérida is popular for its pleasant climate throughout the year. It's notable for its annual carnival celebrations that take place in February.

Route and Accessibility:
Initially, you'd have to fly into Simón Bolívar International Airport in Caracas, Venezuela. From there, you can take a domestic flight to Alberto Carnevalli Airport for Mérida, or Antonio Nicolás Briceño Airport for San Cristóbal. To reach San Antonio Del Táchira, it's more convenient to take a bus from San Cristóbal.

Accommodation and Booking:
There are various accommodation options in all the cities ranging from luxury hotels to budget hostels. Online platforms like Booking.com, Airbnb, and TripAdvisor offer various options. It's recommended to book accommodation well in advance for your convenience and to secure the best deals.

Clothing and Essentials:
As you'll be visiting in the drier months, pack lightweight and breathable clothing. Don't forget a hat, sunglasses, and sunscreen for the daytime. For Mérida, due to its high altitude, a layer of warmer clothing is recommended for evenings.

Health and Safety:
Ensure you have comprehensive travel insurance in case of any health emergencies. Pack any prescriptions you may need, along with a standard travel health kit. Stay hydrated and protect yourself from sun exposure.

Local Etiquette and Respect:
The residents of Venezuela are known for their warm hospitality. Learning a few phrases in Spanish, the local language, can be a nice way to show respect. Be aware of local customs and traditions, particularly in smaller and more rural areas.