Going on dodgy websites won't come to any harm. AFAIK there are no websites which target vulnerabilities in Android. Dodgy websites are written to exploit Windows mostly, and as such there will be no damage done by visiting such a site on a slate. Although it should be noted that you are still vulnerable to phishing as this exploits the person and not the operating system.There are a couple of dodgy Android apps out there (due to the free-for-all approach adopted by Google), but I think they all rely on telephony as they usually just dial premium rate lines etc. But if you just check the comments for any apps you download for any problems and don't download them from untrusted sources then you should be just fine.