I've never hiked before, only walked on trails. Is this park friendly to be hikers? Do I need to have hiking gear or would simple backpack with water, snacks, etc will suffice?

It is a very well worn path that's great for beginners. A small pack with minimal supplies would be more than sufficient.

No gear

Yes there are different levels of trails from and easy afternoon walk all the way up to rock-face climbing. There are more than 8 trails each with different levels

Hiking poles will help if you have a hard time walking

Yep, you don't need any special gear. Be warned that near the top of the mountain it gets strenuous, and there is a bit of scrambling over rocks.

Really all you would need is water.

You can walk without gear.

Great, thanks for the quick replies.