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Routing systems have become very attractive recently. They aim to help users on finding the optimal path to their destinations regarding travel distance,travel time, and other criteria. There are many issues to be investigated such as the multi-criteria personalization of the paths according to user preferences. This paper discusses main routing algorithms and presents the Coolest path algorithm which enables multi-criteria personalization based on travel distance, travel time, points of interest, and path simplicity. The coolest path approach allows users to set the level of importance for each of these criteria. Moreover, a prototype was built in order to validate the proposed ideas.