I'd guess as with most countries you can drive them on private land (with the owner's permission). If you want to use it along Salwa Road and have a death wish - feel free!
At the end of the day, we all see people on quad bikes with inadequate lights and no protection on the roads here at times, so why not a mini bike? Whether you get away with it will depend on your nationality! I trust you take out life and third party insurance before you start! Mini bikes on public roads in the UK set a bad example for the "real" motorcyclists so it won't be any different here. Your call...