Pretty cute. Most preschoolers really get into the dinosaur kick. ...And then they go on a vacation where the trees are ancient and giant! It has got to be where dinosaurs live!!
They should to to Arches N.P. in Utah! I went to Moab on a mountain biking week with friends here about 10 years ago. On one of our rides just outside the park, we were pedaling up a 4wd route, and came upon real dinosaur tracks embedded in the rock formations. Now
that was eerie.
I don't have a picture, but found this on Google:

Not sure if it is from the same location -- it is similar, but not what I remember. The bike ride was called the Klondike Bluffs trail, and at the park boundary, we left the bikes and hiked in another half mile to the bluffs. The tracks were somewhere outside the park.
Klondike Bluffs:
(link)