Well first of all, Europe is a large place, and you didn't really specify which part of Europe you will be traveling to. Also, it depends what type of vacation you are considering. Will it be a backpacking type of holiday, or a bus or train tour?
There are so many types of European holidays, and depending on your budget, it can vary from the prices of hostels and hotels. Also, rent a car costs vary from country to country. If you are traveling in the countries that belong to the EU, some of these countries use the euro, and some still use their own currencies.
Just to be sure, it's advisable to take a visa card with you, as most of Europe accepts Visa more than other cards. If you are taking your mobile phone, make sure you check with your phone company before you go, as you will probably need international roaming. Make sure your passport is up to date, and always take photo copies of all your important documents.
If you take any medications, make sure you have a letter from your Dr. or Pharmacist, with a list of the medications you take. Some tablets and medications go by a different name in Europe, and if you run out, they can give you the same tablets, but they may go by another name). If you are traveling in the high season,( June-Sept) be prepared for crowds at the popular tourist attractions.
When you go shopping, if it is a Marketplace or open air stalls, you may be able to bargain, but these places most always prefer cash. If you are staying in Hotels, always ask at the Reception, if the tap water is drinkable. Bottled water is quite expensive in a lot of European Countries.
When you are packing for your holiday, always check the weight allowance of the airline Co. , as they do charge for overweight in luggage). This is just a bit of advice to start with, as you didn't specify exactly one subject.
Hope this helps.
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