If your trip to Lisbon District is all locked in but your itinerary is looking a little empty, we can give you a few hints and tips.Think of Lisbon District and then say the first thing that leaps to mind. You probably said "Castle of Sao Jorge," right? Being such a well-known attraction, you just can't miss it. Throw your luggage into the trunk and tick it off your bucket list.Take in the best of what this place has to offer by adding Rossio Square and Lisbon Cathedral to your schedule. If you've got an extra day or two to spare, take a look at Gulbenkian Museum and 25th of April Bridge too.Plan a stop at Commerce Square. It's one attraction you'll find on many travelers' must-do lists. Lisbon Zoo and Marquis of Pombal Square are also close by and worth taking the time to see.