Event though many people visit Seoul via Incheon, nobody knows about Incheon. Incheon airport is just a 10 minutes away to the beach. Why don't you enjoy the beach and Korean scenery. You can see insight Korea.

Korean local food also good think you can try. For example barley Bibimbapbarley with some vegetable.  Noodle with some seashells.

Don't spend long time to go to Seoul, enjoy longer at nearby Incheon International Airport in Incheon.

Itinerary:

Choice A: Airport - Yeongjongdo island (where the airport is locaded) - Airport  

Choice B: Airport - Old Incheon city - New Incheon city  - Airport

........ If you go out of Yeongjongdo island(Airport is located), you need to pay USD20.00 more. 

Price Per Group : USD 320.00 (up to 7 people) [This is fixed price, never mind the price above] 

Tour Inclusions:

Guide (English) Car, Gas, Parking and Toll fee.

Tour Exclusions:

Meals & Drinks Entrance fee (if any)  Personal Expenditures