First of all, it always pays to be nice to people. Even if it is tough, being kind and generous is always the way to go.
Next, don't believe all of the stereotypes you hear about Europe. For example, not everyone wears black clothes 24/7, most French people are quite nice if you are nice to them, and, disappointingly, not every gondola ride in Venice includes an opera performance:)
Thirdly, don't be afraid to 'wing it.' I mean yes you should probably plan out everywhere you are staying ahead of time but you don't have to plan every single activity beforehand. For example, in Italy we really enjoyed taking back roads to some of the major towns just to get a feel for the rural life in Italy. Also, eating at random street-side cafes is sometimes more fun than having a fancy dinner reservation every night.
Here are some general tips for traveling if you ever plan on going to Europe:
- Pack extremely light (we had to haul our luggage quite a long ways in Venice and also there are really no elevators in European hotels or b&bs)
- Keep your money and passport on you always- even though none of us witnessed pickpockets, it is comforting to know where your valuables are at all times
- Allow a few rest days because touring and sight seeing is more tiring than you think
- If you plan on renting a car, know how to drive a manual-automatic cars are not common in Europe
- Try new things- you can't discover something good until you try it