It mostly depends on you, you wants. Just ask you these questions :

What Am I looking for ?

It could be quietness and tranquility, sun, discover naturals landscapes, discover a big city, parties, diving…

• Malta : Parties, Sun, Beach (inexpensive)
• London : Visit, Monument, Shopping (expensive)
• Barcelona : Sun, Visit, Parties, Shopping (expensive enough)
• Porto: Visit, walk, tranquility (inexpensive)
• Dubai : Activities, parties, shopping (expensive)
• New York: Visit, Shopping
• San Francisco: Visit, Shopping
• Yosemite (National Park): Naturals landscape, walk
• Los Angeles: Activities, sun, beach (expensive)
• Marrakech: Sun, visit (inexpensive)
• Jerusalem: Cultural
• Tel aviv: Shopping, sun, beach, parties

With who I want to go ?

You may not make the same activities with your mother and your best friend. Make sure you have the same wants and you want to do the same kind of activities

What is my budget ?

Of course the budget varies depending on the destination.

Be carful ! Even if you find and cheap hotel and flight do not forget that the living cost could be high. For exemple Dubai or New York

When do I want to go ?

For some destination do not forget that you there are rainy season.

About United Emirate, the temperature is very high in summer. In addition during Ramadan the country is less dynamic and you have to respect some rules to respect people who abstain from eating

How much time do I want to stay ?

This question can be relevant if it is a long trip with a time différence.

1 week in New York (-6h) can be enough, but 1 week in San Fransisco could be tiring (-9h).