Very few limits really on where or who you can fly,basic PPL lets you fly most single engine aircraft during the day, there are obviously restrictions flying into places like Heathrow, but even that CAN be done if you have a big enough wallet! But you could fly right round the world on it. I would suggest heading to a local flying school at some time and having a chat, do it on a dud weather day and they will I am sure have loads of time to tell you what is involved, what you can do with it and what books to buy etc.