The Approach
Canada converts Tourism directly into Diplomatic Favor (1 Favor per 100 Tourism per turn) and cannot be surprise-declared on, which means you can invest in Culture-building infrastructure without the usual risk calculus. The practical build order: get National Parks up early using Mounties, lean on the peaceful-civilization bonuses to stay out of costly wars, and let the Tourism-to-Favor conversion snowball while you spend that Favor on World Congress resolutions that favor your position.