Hi Snapshot
I would suggest doing a take-off and then as many landings as you can fit in - don't bother with circuits for your first go if you only have an hour as you will waste a lot of time. You should be able to fit in around 8 landings if you ask to be positioned at 5 miles.
If you are on the 747 sim Kai Tak should still be there but if not ask for the Canarsie approach to 13L at New York JFK. It is very similar but without the hills! Also for a bit of fun ask for Runway 27 at Boston at max landing weight and see if you can stop before going into the sea!
Have fun!