Round Iceland in 7 days

"In an amicable way to look at all Iceland, 2-3 weeks are necessary. Then you will have enough time to go round all western part of the country known for the fjords, and to take a walk in the central part where there are glaciers and national parks. But if you have on hand only a standard holiday from 7 days, you need unambiguously to take the car and to go on...