Europe.

Get a guidebook, such as Europe on a shoestring, which especially caters for budget travellers. If you are planning on travelling by train make sure you get European timetable and lasting be prepared.

How much cash:

Europe is now working in Euros instead of local currency. As a traveller you are advised to take Euros, which actually makes it a lot easier for you. Take a switch card to draw money out of the bank if needed and budget yourselves to only spending do much a day.

Lastly check exchange rates so you have a good knowledge of them when you travel.

Where to stay:

Hostels and campsites are the cheapest places to stay whilst travelling Europe. Check out the campsites before you travel to make sure they are safe and well equipped.

New York.

Avoid renting you own car as driving in Manhattan is a nightmare. The subway is a good form of transport. Subway tokens are a bargain as once purchased you can travel all over Manhattan. Try and avoid walking the streets alone as they are quite dangerous.

How much cash:

It is quite expensive and so make sure you have plenty of money.