Tour & overnight in Vancouver for parents?

I was hoping someone could help me. We are arriving in Vancouver on Saturday Sept 1st and are traveling with our parents in their 70's. They are moderately ok traveling alone but have expressed interest in staying overnight in Vancouver and exploring the city on their own. My husband and I are unable to stay and were looking for any tours that would get them from the cruise port, show them around on Saturday, maybe provide hotel for the night and then get them to the airport the next day. Has anyone used any tour services they really liked? I've seen several things out there but am a bit nervous about sending them out on their own without knowing more. Thanks!