Its very important to think about what will be an ideal or a perfect holiday for yourself. What is your goal of your holiday.
Do you want to relax in peace, is it an escape from your daily grind, are you visiting a place to explore, do you wish to engage in a standard Touristic tour package, do you want to break free & chill in cafes, bars & dance around, do you wish to engage in adventure like trekking, paragliding, rafting, bungee jumping.., experience local life etc.
Setting a wish from a holiday will set a path for you to plan your destination, help in choosing the activities that you would engage in, assist in picking correct type of accommodation etc.