velodrome for your personal hour record
a really, really long climb
more World Championship/Grand Tour/Monument courses
Richmond would be a great spot for a criterium course.
Richmond should be accessible via a bridge from Watopia, therefore becoming an option you can choose every day (if you wanted to) and long distance rides can be more interesting as you can go back and forth as you wish.
There can be another turn somewhere to get to a Velodrome as well.
I would love to see the Circuit through Paris on the final stage of the TdF added as a new course in all honesty.,