If your trip to San Sebastian is all locked in but your travel itinerary is looking a bit empty, let us give you a helping hand.Monte Urgull and Concha Beach are cool attractions that all serious sightseers should make time to swing by. Map out a route and enjoy taking in each one.Not too far from the city center, Ondarreta Beach is one spot to consider adding to your to-do list. If you still have some room on that travel itinerary, Reale Arena and Donostia-San Sebastian Aquarium will keep you busy as well.