I strongly suggest eating at both Mythos and Three Broomsticks if you can. Mythos has the edge on the food and Three Broomsticks has the edge on atmosphere, in my opinion. I recommend lunch at Mythos and dinner at Three Broomsticks. Both are great, either way! :thumbs:
Don't forget to explore CityWalk, as well! I recommend hitting up the Hard Rock Cafe and asking for the VIBE host to get a tour of the place.
The mini-golf is also neat. If you're only doing one side, I recommend the alien side. I'm actually more of a horror fan than a sci-fi fan, and I still found the Alien side more enjoyable. Plus, they stole my heart by having Pink Floyd music playing in the spot with the cow ("Atom Heart Mother" reference maybe?).
Rising Star Karaoke at CityWalk is also another cool place. They have a live band and it's a great time whether you like to sing or just watch. I think they are 21 and up, so that's something to keep in mind if you will be with young ones.
Outside of Universal Orlando Resort, you have Fun Spot nearby and they have a couple new coasters and some other rides. They even have a Sky Coaster if you're looking for an intense thrill (at an up-charge). You might find special offers online for wristbands or you could just pay by the ride.
What other type of things are you looking to do? Family friendly, more adult type of stuff?