Hi there! It's great to hear that you're planning to visit Mérida, Barinas, and Caracas. Here are some travel tips for you.

Best Time to Visit:
The best time to visit Mérida, Barinas, and Caracas specifically is during the dry season, which is between November to April. However, please note that the weather conditions might differ slightly in each region.

Route and Accessibility:
You can reach Mérida by flying into Simón Bolívar International Airport in Caracas and then taking a domestic flight to Alberto Carnevalli Airport in Mérida. As for travelling to Barinas, you can take a bus from Mérida. Caracas, the capital city, is well connected by road and air to the other cities.

Accommodation and Booking:
These cities offer a range of accommodations, from luxury hotels to budget hostels. I recommend booking your rooms well in advance, especially during the peak tourist season. Websites like Booking.com, Expedia, and Airbnb can be used to book accommodations according to your preference and budget.

Clothing and Essentials:
Pack lightweight and breathable clothing for Barinas. For Mérida, pack warm clothing, as the temperature can drop due to the altitude. Essentials should include sunblock, hats, insect repellent, and a travel adaptor for your electronics.

Health and Safety:
Ensure you are up-to-date with routine vaccines. Also, consider vaccines for Hepatitis A, Typhoid, and Yellow Fever. It's advisable to drink only bottled water. Always maintain vigilance when in crowded areas as petty crime can occur.

Local Etiquette and Respect:
Venezuelans give lot of importance to politeness. Always greet people with a handshake, hug, or kiss on the cheek. Dress modestly when visiting religious sites and always ask for permission before photographing people.