S.A. Desert Parks Pass

My wife & I are (hopefully) going to be visiting Mt Dare and Dalhousie Springs as part of an excursion later in the year, but will basically be in & out of the National Park on the same day - we're not doing the Simmo this time, and won't be camping in the National Park either. Can anyone tell me if we need to pay for a Desert Parks pass just for a day trip?

Thanks,

Lockie