I plan on spending 3 months in Brazil this summer but am increasingly concerned about safety. I have heard there is hostility and even aggression towwards Americans, and plenty of mugging and violent crime in the big cities. For example if go the beach myself is it crazy to leave my stuff under my towel on the sand whilei swim?? Walking about walking alone at night exploring the city? I also want to drive a car down the coast - is hijacking and bad driving a big problem? Any advice or tips and do's and don'ts much appreciated. Thanks.