Unless it is private property (and it's not, AFAIK), fine print on a ticket does not trump state law.

As for "NPS rules" I don't know where you're getting that from but it's nonsense. First of all, NPS abides by state law regarding CCW and has since circa 2010, and 2nd the property is either owned by the NPS or it's not, period. If it is owned by NPS, then NPS rules apply (which means state law applies.) If it's not owned by NPS then state law applies.

IOW, state law applies no matter what, and state law is pretty clear on the subject. CCW with a permit is not permitted:

1. On the real property of public elementary through high schools (except that firearms are permitted in vehicles and when participating in recreational hunting or shooting activities on such property)
2. On Federal property (where Federal laws apply anyway)
3. On private property where the property owner doesn't allow it and
4. On public property where there are metal detectors and everybody is searched.

Source: CRS 18-12-214

Those are the ONLY places where your CCW permit does not allow you to carry.