São Francisco de Paula - this location is quite Beautiful with campings and a lot of nature to apreciatte.
Riozinho - Very nice place, I recomend the Conduto Camping
Canela - If you want a place with good spots to eat and places to see, then thats the right option
Gramado - Its for a romantic trip, to a good wine and for cinema
Porto Alegre - its my place and I really love all what this city offer.
All this places take very little distance to come and go.
Hi @dcfeijo and welcome to Connect!
Thank you so much for sharing this valuable information with the community. I’m sure that a lot of people will find your post helpful. If I ever come to Brazil, I’ll make sure to visit at least one of the spots that you mentioned in your publication. It’s probably going to be Gramado. 
Do you have any pictures from this places? I would love to check them, so feel free to share them here on Connect.
P.S.: Please note that I relabeled your post from Photography to Travel, as it fits better to the aim of your publication.