We will have several hours between flights and, if we don't take transit tour around Seoul, wondering what there is to do in Incheon and in the airport? 90 minute drive into Seoul is something we would be happy to miss. Thank you

Actually Incheon airport is on "Yeongjeong Island" (called Yeongjeong-do in Korean, "do" = island) it's a pretty big island with lots of seashore as you can guess and also lots of beaches ringing the island. If you are adventurous you can try to navigate the local bus routes to get to one of these beaches but I'd recommend you hail down a cab (or better yet, tell the info desk you want a "call taxi" and they'll order one) and tell them to take you to one of the beaches ON the island. The only beach name I remember is "Eulwangni"** ... or you could get the driver (with help from a Korean) to take you beach-hopping, visiting a few different spots. And these beaches have places to buy drinks, beer, raw fish, etc. etc. Better than sitting in the airport lounge.

Here's information about the Incheon Airport http://english.visitkorea.or.kr/enu/GK/GK_EN_2_2_2_1.jsp (buses to surrounding areas, etc.)
and another page for things to do & see in incheon http://english.visitkorea.or.kr/enu/SI/SI_EN_3_1_1_1.jsp?areaCode=2