You can walk freely in the park around the pagoda. Howeverif you want to climb it, you have to pay (I forget the price). The park is nice and there are a few shops if you want to buy souvenirs. You can also ring a big bell for a few yuan.
The pagoda is smaller than the big one (obvious !) and it may be mpore difficult to climb if you have some troubles (stairs are steep and small. As for the big pagoda, the view on the top is not that impressive because Xi'an horizon is full of ugly buidlings. The top floor has also fences to prevent stuff to fall and it blocks the view.
If you own or manage Xi'an Museum, register now for free tools to enhance your listing, attract new reviews, and respond to reviewers.