Is Kalbarri and Perth city realistic in a seven-day trip?

If the city and family time matter most, shorten the northern loop and leave a full day for Perth or Fremantle.

Choose a few anchor stops and avoid squeezing every town into the return drive from Geraldton.

Count the driving days to and from Kalbarri before assigning one day to each attraction; the northbound leg is a significant part of the holiday.