First you enter the important information
This can be as generic as "somewhere warm" and ChatGPT will find somewhere that suits your needs. For example:
The timeframe for the trip, useful for deciding which things are most important and what's in season.
The most generic of the inputs - a description of what you want to do. From seeing one of the 7 wonders of the world, to exploring a rainforest, to exploring city nightlife.
Then like magic, ChatGPT will determine the optimal places based off of too many factors to count, and provide you with a custom itinerary