Land travel offers more options. Cruises are offered mostly in the Mediterranean and on large rivers like the Danube.
When planning your vacation I suggest to do the following:
* define your time horizon - first day and last day. Take into consideration that you will experience jet lag; therefore the first day should allow for extended rest time.
* list the countries or cities you are interested in
* consult a map where these cities and countries are exactly and relative to each other to define the order in which to visit - don't forget the restrictions your time horizon might place on your plans.
* Go to a travel agent and discuss if your ideas make sense.
If you prefer to travel individually you will run into the following challenges:
* language: Not everyone in every country speaks English. You will need to learn at least few sentences in the local language of each country you intend to visit.
* timing: When driving yourself allow for traffic jams and getting lost. When using trains, ships, buses, and airplanes make sure to ask local people how punctual these are usually.
* opening hours: Many European countries have restrictions regarding the opening hours of shops. Not all museums, etc. are open all days.
If you decide to travel with a group be prepared that your personal interests might not be fully met - but you will have a translator and somebody else making the decision where to go at which time of the trip.
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