Sure, South Korea is a popular travel destination with its unique culture and beautiful landscapes. Here are some travel tips for your journey to Seoul, Busan, and Incheon:

Best Time to Visit:
The best time to visit South Korea (Seoul, Busan, Incheon) is the spring (April to June) or fall (September to November) seasons. During these months, you can enjoy pleasant weather and beautiful natural scenery.

Route and Accessibility:
Incheon International Airport is the primary point of entry. From Incheon, you can reach Seoul via airport railway (AREX), and then to Busan by KTX high-speed trains. South Korea's major cities are well-connected by efficient train and bus networks.

Altitude and Acclimatization:
These cities are at sea level, so there's no need to worry about altitude sickness. However, if you're planning to hike in mountainous areas, take it slow to acclimatize to any changes.

Accommodation and Booking:
Book accommodations in advance, especially during peak travel seasons. Try to stay in central areas or close to subway stations for easy mobility. Options range from luxury hotels to budget guesthouses and traditional Hanoks.

Clothing and Essentials:
Pack according to the season. The summers are hot and humid (light clothing), whereas the winters can be extremely cold (heavy winter clothing). Don't forget to pack a good pair of walking shoes.

Health and Safety:
Most areas in these cities are quite safe. However, remain vigilant in crowded places. Carry travel insurance and keep emergency contact numbers handy.

Local Etiquette and Respect:
Koreans value respect for elders. Use both hands when receiving something from someone older or in a higher position than you. It's also common to bow slightly when greeting. Be mindful when visiting temples or other religious sites by dressing appropriately.

Language:
Most locals, especially young ones, understand basic English. However, learning a few basic Korean phrases can be very helpful. Download a language translation app for ease of communication during your travel.

Lastly, try a variety of Korean food and enjoy their rich culture. Have a great journey!