If you're going to terminals 8 or 9, get off at terminal 1 and switch to the train across the track that circles the terminals in the opposite direction. You'll save 3-8 minutes.
You can always use free wi-fi internet near delta & sky priority lounges. Name of network "tmobile" and it has no password,
Istanbul is famous for traditional Hammams. Visit the Cemberlita Hammam in the old town of Istanbul for example. It was built 400 years ago and renovated lately - but the historic flair still remains.
