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Most of the Copacabana beachfront restaurants are pretty bad. The only one that I've found to be consistently good is Don Camilo's. It's the only place in Rio that I've found that has good fried...

If you must go to Centaurus I'd suggest negotiating at the front door that you will only pay the entrance fee up front (since you are a non-brazilian you will be overcharged for this anyways). After...

I use MagicJack too and I agree it's great. Another nice feature is that when you're offline it will record voice mails for you and then email you a wave file so you can hear the voce mail.