Hello! That sounds like an exciting trip. Here are some travel tips for your visit to Bogotá, Medellín, and Cartagena in Colombia:

Best Time to Visit:
The best time to visit these cities in Colombia is during the dry season, from December to March, when there is less rainfall. However, Colombia's weather can be unpredictable, so be prepared for occasional showers.

Route and Accessibility:
Bogotá, being the capital city, has the largest airport in Colombia, the El Dorado International Airport. From Bogota, you can easily take domestic flights to Medellin and Cartagena. There are also bus and taxi services available within these cities for local travel.

Accommodation and Booking:
Each of these cities has a variety of accommodation options ranging from budget hostels to upscale hotels. It's recommended to book your accommodation in advance through reliable booking platforms for the best deals and availability.

Clothing and Essentials:
Pack comfortable, light clothing for Cartagena's tropical climate. For Bogotá and Medellín, you'll need to pack a mixture of light clothing for the day and warmer options for cooler evenings. Don't forget your essentials such as travel documents, medications, sunblock, and mosquito repellent.

Health and Safety:
Colombia is much safer now than it was in the past, but it's still essential to remain cautious. Avoid displaying signs of wealth and keep belongings secure. As with any travel, ensure you are up to date with vaccinations and have comprehensive travel insurance.

Local Etiquette and Respect:
Colombians are known for their warmth and politeness. Learn a few Spanish phrases, as this is appreciated by the locals. It's also a good practice to tip for services in restaurants and hotels.