Even the best parks are littered with dog poo I suppose....
Back on topic.
Step one, get an American iTunes account.
Step two, buy an iTunes voucher somewhere
Step three, download apps from the iTunes store.
Step four, have lotsa fun!
You can find the exact details on the first coupla steps here..
Yes, you can buy apps from the App Store, buy music and movies from iTMS and there are Ebook subscriptions from various publishers. Lots of cool stuff. Works in the US though.
Check out the following apps... cheap and super cool!
AirVideo - streams any file format on a home network to the iPad
Weather HD - Who knew weather apps could be this cool.
GoodReader - The best PDF reader I've used on an i-device.
Camera to iPad - if you have an iPhone.