Rio de Janeiro is a very dangerous city.  We were told by multiple people to be very careful.  You should never walk around with your cell phone out because someone could run up to you, grab it, and run off.  You should have a lock on your purse or a clip to prevent it from being unzipped.  You shouldn't walk around at night.  Etc.  

Iguazu Falls is amazing, and if you're visiting another area close-ish to it, then I say go.  To me though, it wasn't enough of a destination to be its own trip.  It's not cheap, and it's not as cool as going to Victoria Falls.  

Buenos Aires is one of my favorite cities.  This was the 4th or 5th time I've been there, and I'd go back again and again.  It's very European, and it's easy to get around using buses and metros.  The people are nice, and they are passionate about their opinions which makes things fun.​

Southern Patagonia, while majestic and beautiful, was a letdown for me.  Maybe I built it up too much in my head; maybe it was from hearing so many wonderful [possibly exaggerated] stories from other travelers; maybe it was how hard we tried to do it on a budget.  Whatever the reason, I was disappointed. 
 
Colin and I rented a campervan and road tripped around the Southern Patagonia, from El Chaltén to Ushuaia, for 16 days, September 1 – 16, 2017.  We had trouble finding information about how exactly to road trip around Patagonia, so we wrote about the details of our trip in our how-to blog, McPatton Manual.  See that post here.  

At the bottom of this post, there are photos of each of the major parts of our trip.  To see even more photos from the trip (which I highly recommend), check them out here, and for an EVEN BETTER visualization of the trip, see our YouTube videos on the playlist here.