Start with deciding what do you want to be doing for the next trip. Do you wish to get some tan lines and some fun in the tropics? Or would you rather have some fun in the snow? If you have a bucket list of places you want to go, this will come easily to you. However, make sure you consider your travel budget as well. Ensure that you take into account the climate of that time of the year as well. You do not want to visit Melbourne in July and stay indoors since it would be freezing cold outside.
Also, decide if you are going on a short trip or a long trip for the vacation. If you are planning a somewhat long trip, you will have to make plans to pay much less for a day on an average basis.