ok, here's my 2c
Been there a couple a times, and as long as i'm married will be going again...that's where my wife's from. So, needless to say, never been there as a single dude.




But for what it's worth, here's my advice.
Rio is divided into several zones. The happening one is the south one (Zona sul). This area includes Copacabana, Ipanema and Leblon. If you can afford it, stay at Leblon, by far the safest area (it's expensive), and still on the beach. Ipanema is ok, very good restaurants and shops there (remember, i'm married

). Copacabana is a DUMP, a bunch old dive bars with pickpockets galore. This HELP joint the other guy mentioned is a has-been dump with nasty prostitutes feeding on the gringos, but if that's your thing...
The girls in rio are like none other. Try the beach and you'll see what i mean. Go to the shopping center in the Barra region to see the hottest dressed-up mall girls you'll ever find. Barra is also the upscale area...there's a really cool grass airfield there with kitplanes, very busy on the weekend. I'm not a club dude, but if you like bars you'll find plenty in Leblon and Gávia (next to each other), and the bars are a happening place with live music.
And if you're into turisty stuff you HAVE to go sugar loaf, the best view ever. To see a 737 takeoff BELOW you is something else (SDU). The Christ statue is actually higher but i don't like the view as much, hazier, less visibility.
There you have it....where's my commission??? :smash: