Hello! It's wonderful to hear that you're planning to visit Panama City, Gamboa, and Colón. Here are some useful travel tips.

Best Time to Visit:
The best time to visit Panama City, Gamboa, and Colón is during the dry season, from mid-December to mid-April. The climate is ideal, and you will find lesser rain which will allow you to explore these places more comfortably.

Route and Accessibility:
Panama City has an international airport - Tocumen International Airport. It is connected with major cities worldwide. From here, you can rent a car or take a taxi to Gamboa and Colón. Public buses are also available but they might be a bit complicated if you aren’t familiar with the routes.

Accommodation and Booking:
You'll find plenty of accommodations in Panama City, from luxury hotels to budget hostels. Gamboa and Colón also have decent lodging options. Online booking is recommended, preferably a few months in advance, especially if you plan to visit during the high season (December-April).

Clothing and Essentials:
Pack lightweight, breathable clothing for the humid tropical climate. Don't forget your swimsuit, sun protection, and insect repellent. Rain gear is necessary year-round because rain showers can occur even in the dry season. Comfortable shoes for walking and hiking are also recommended.

Health and Safety:
Make sure you're up-to-date on routine vaccines before going to Panama. Travellers are also advised to take vaccines for diseases like Hepatitis A and Typhoid. Always stay hydrated and use a sunscreen to protect your skin from the sun.

Local Etiquette and Respect:
Panamanians are friendly and hospitality is a common trait there. Spanish is the dominating language, so learning a few basic phrases can be helpful. Remember to respect local customs and traditions, especially if you visit any indigenous communities.