Depends on your definition of thrill rides.
Hulk, Duelling Dragons, RRR are to me the only big coasters.
There are loads of well themed rides that are not big thrills, but unmissable all the same.
Jurassic Park River Adventure, The Mummy, Dr Doom, Despicable Me, Spider-Man, MIB.......and others of course. Harry Potter of course too.
Then there are shows like the Horror Make up Show which is very funny and not to be missed.
Also both parks have amazing themeing that you should enjoy......and the Talking Fountain is a true highlight.......I could spend hours there just watching people's reactions........very funny.
Have a look at the Universal Orlando website and see what sorts of things your family would enjoy.
Both parks deserved to be enjoyed properly without just rushing through them, they are both a lot of fun.
3 full days minimum, even if you opt to stay onsite which would be ideal as then you could enjoy some resort time too
