My parents-in-law had a tour to Quecbec city this May. Not too bad. The only potential problem is the bus. 中环旅游 is the only travel agency that has a bus, but it is quite old, it could be "on-strike" if you are unlucky.
Anyway have a good trip.
I traveled to U.S with 中环旅游 a few months ago, and it is terrible experience since 中环旅游 will pass the traveler to a Montreal travel company which is very bad. So I do not like 中环旅游.