I want to travel somewhere in latin/south America, where should I go?

I will spend a month in August somewhere south. I want to be able to lay be a beach and/or pool. Practice dancing salsa or tango, be near culture (museums, etc), practice speaking spanish, and have nice weather. I'll be doing it alone. Where should I go?

Brazil!

well if you want to practice spanish you can try Peru and visit Machu Picchu in the Andes and im pretty sure you can find salsa places if you look....and there is also a beach but it is usually cold...it kinda hard to get all you want in only one country...

Tango and culture?
Argentina.
Buenos Aires is very european , affordable, great food and incredible nightlife. People are beautiful, a mix of latin and european.
Just, don't expect nothing "typical" of latin America. no mariachis or tacos. They have great pizza, ice cream, pasta and beef. Many museum, theatres and they even have 24 hours bookstores!
Buenos Aires was voted many times the best city in LAtin America by Conde Nast Traveler, Travel+Leisure, etc.

People are extremely friendly, and they'll make you feel at home.

i love argentina but i think you should go to Brazil...

if you want to improve your English and visit touristic places i recommend you travel to Peru. in august the things are very cheap . yo can travel to Cuzco (august is an special date because the prizes are low ), there you can visit a lot lot lot lot lot of of place outside the city or into . you can also visit the north of Peru like lambayeque, cajamarca, the weather is cool and you can practice Spanish. i recommend you travel to Peru because we are the unique country of south America that no use (ascent - this word is in Spanish, i don't know how to say it in Spanish)

in response to some of the answers...I'm sure brazil is very very nice. I've met some of the most awesome brazilians who tell me that brazil is wonderful but they speak portuguese in Brazil and not Spanish. Well most people do speak spanish especially in regions bordering other spanish speaking countries but their first language would be portuguese

Panama. Two oceans in less than an hour. Dancing salsa (not tango) all night long.
Cultural life is small, but fun. A couple of big museums and thats it.
But we do have the canal, that‘s fun to watch; the rainforest (almost next to the city), birdwatching activities, visiting indian towns, and many other fun activities.

Argentina!!!!!!!!! i have been there and it is amazing..such a beautiful country..it reminded me of italy or spain....in the near future i would also like to go to Uruguay, Chile, Brazil and maybe Cuba

Argentina. Maybe in August you won't be able to go to the beach, but if you want tango there's no better place than Buenos Aires. There are many museums too, and a lot of people can speak English as a second language. The weather is not very cold, maybe 15°C...
I'm from Argentina, I live here, of course, and I know that all foreign people who come here have a great time.

Greetings.