Am I able to still enter the park if Im not using my vehical with the pass.

If you come in a motor vehicle, you need a pass. If not, such as on a bike or walking, then no.

We have a pass.

Need a pass on any vehicle can walk in free but if driving need to have a pass or pay there

No you have to get a pass. It cost 11 dollar annually

You will have to pay for the vehicle without a tag.