We have driven all over the Maratimes on our own. Have not yet gone to Newfoundland - it requires advance planning to get on the ferries :( something we are not often good at. The currency is a non issue just assume $1 = $C1 and you will be happy with the discount.
If you travel the US on your own it is no different in CA. Quebec can be interesting as it is French speaking and adamant about it. Have a phone plan with Canadian service for the duration of your trip and depend on cg wifi, just like here.
Nova Scotia has a great tour guide book for free from the Provence as does PEI. Not so sure about New Brunswick, but it is easy to get the information. As for NF there are plenty of online resources detailing tour routes and things to see. Never have had a problem making friends in campgrounds or at the table next to us in a restaurant so socializing is not an issue for us.
Having said that I have talked myself out of a caravan there and will think about booking the ferry for 2017 - if DW agrees.