You can't compare the restaurants and the gastronomic offers with that of Capital, Córdoba etc.
Puerto Iguazú is the only touristic place that deserves that name. The other locations (the Jesuitic Ruins in the south, Oberá in the middle, and Los Saltos del Moconá in the upper right part) are very off the beaten track. They are all small rural places, where one would have empanadas, pizza and asado on rotation every single day.
There is no sea but there are rivers and falls. Also a lot of mosquitoes!
But it is cheap and you can see wild animals (parrots, birds) in any garden and rent a place with a pool.
Posadas, the capital of Misiones, is sadder than San Juan. Dirty and poor.
Just the other day, my SIL offered my husband to go to her place in Mar del Plata for a month and half to pet sit her bunny. But in May-June it is very cold and windy on the coast, and even a MDP lover like my husband said that after 3-4 days in winter it is boring and depressing over there.