We have a (nearly) 3 year old, an 21 month old and a 9 month old.
Obviously at our kids' ages, they're mostly in/out of strollers. What sort of things do you enjoy doing in the US?
There are loads of parks around here, there's petting farms etc too. My kids love a trip to the coast, Roker beach is nice and it's quite unique in that the park exits straight onto the sea front. Then you've got (going North) Seaburn, Marsden, South Shields, Tynemouth etc.
There's a large outdoor museum nearby called Beamish museum which is great for a day out and it's huge, like a full village, but victorian era.
Newcastle has some good musems, such as Hancock/Discovery, and then there's the Life Centre, Sunderland has the museum and winter gardens which are well worth a look too.
I'll try to think of other things!