arpoador beach can be seen on this satellite view, zoom settings open correctly when using chrome - on this link an early morning shot of the beach is posted daily, showing water conditions.

this link shows praia do diabo on a wikimapia, best seen using google chrome, as it might not open correctly with other browsers - on this link an early morning shot of diabo's beach is posted daily, showing water conditions. 

the website waves includes charts showing tides, winds, temperatures and overall climate forecasts - containing constantly updated data provided by the brazilian navy, waves is a valuable resource for anyone planning to surf on any beaches in rio.