im going to budapest in 12 days time and have been told about a boat trip that takes you to vienna for the day, however all i have come across on the internet is the hydrofoil?? i think it was called this, but i was told that was slow and expensive, but i just cant seem to find any other boats that take you there. can anyone enlighten me please? and also, i know this may be a stupid question but i will have to take my passport with me to enter austia wont i?? sorry!! this is my 1st trip abroad ever so i know nothing about travelling.