After getting off very long flight and to hotel, should i walk or sleep?

Walk if you can: If it was a long flight, and the hotel is close enough, you have the time and not too much luggage, walking would be ideal. It gives you a chance to stimulate your leg muscles and get the blood flowing again, decreasing your risk of developing blood clots after a long flight. Taking steps to preventing clots, which can reduce risk of heart attack or stroke, much more important than a taxi ride!