Simply select the different filters provided. One of the best ways to refine is by departure month and duration of the tours. You can then select age groups, themes, start city, end city and also refine by category.
Let’s say you’d like to go to Greece. Tours will show up with options to refine your results. Try refining by tour category (select as many or as few of the images as you’d like), departure month is may or use the other options.