One of your first stops should be Northumberlandia. Here, you'll be able to find your bearings and get lots of useful information before you begin exploring.
You'll have no end of sightseeing choices in Tynemouth. Northumberlandia is a great place to begin here, but there are numerous other worthwhile spots to discover. Tynemouth Aquarium, Wet 'n' Wild Water Park, and Tynemouth Castle are close to the tourist information center and will top off your day nicely.