Can I walk or bike in (with no car) for free?

It is no longer free to walk in.

From their website: pedestrian or bicycle is $1.50.

Biker/hiker entrance fee is $ 1.50 unless you are a Marion county resident, then it is free.

Yes

Yes you can.... Also you will enjoy the beauty of park very well on bike....

Absolutely, there's a trail and a bicycle lane too.

I do. :) hit a trail

I not sure..​

I think the $5 entrance fee isnper car, so yes.