In no particular order
-- Americas --
Brazil - Interlagos
Argentina - Potrero de los Funes
USA West - Road America / Laguna Seca
USA East - Cleveland (Would be cool on that wide, bumpy track)
Canada - Montreal
-- Europe --
Monaco - Monte Carlo (like said above, for the historical value)
Belgium - Spa
UK - Silverstone
Portugal - Algarve/Portimão
Italy - Monza
Germany - Hockenheim
European - Nurburgring/Imola with old Tamburello (improved safety)
-- Asia/Oceania/Middle East --
Singapore - Marina Bay (night race)
Japan - Suzuka
Australia - Bathurst
Malaysia - A little bit late, but not as late as this year's race.
Macau - Macau Street Circuit
And maybe a special TT, worth half points (5,4,3,2,1) in a big track like Nordschleife or Isle of Man TT. To avoid being too "decisive", somewhere early in the european season.