Without a doubt the currency does and always has had an affect on travel costs. I'm not sure I buy into the evrything is super cheap in the US. Probably depends where you go to. We prefer California to Arizona or Texas and of course that comes with a price but we actually find fruits and veggies to be similarly priced. Sometimes they are more in California. Again it will depend where you are in Canada. We are in a high produce area in Canada and are literally surrounded by orchards and small scale vegetable farms so its hard to compete with that. Fuel is cheaper in the US but we don't go through tons of that anyway (we drive smart car diesels) . I don't think RV parks are that much different.
The other thing is I suspect many of us have a US Canadian mix in our portfolios including real estate. Although that doesn't help the cash situation it certainly does from the Asset cash out point of view.
We are semi retired and only work in Canada in the summer. When we fully retire at 60 we will give up our US RV snowbird lifestyle and probably adapt to a Southern European RV snowbird lifestyle. Just the savings in health insurance cover the cost of the plane tickets to europe. :) We have enjoyed our North American travels and have seen 65 American and Mexican States but it is getting time for a change and we absolutely love europe. Overall I doubt it will be much different for cost. I think Morocco will be cheaper from what we have experienced but I can't see spending more than a season or two there. Time will tell.