I'm 5'5" so you'd want to go higher than mine if you want taller. Some people say for park you want them at nose-eyebrow level, some people say go higher, some say go shorter than that even. Charts say for 5'6-8" anywhere from 155cm-180cm but I think the tallest I'd go for park at 5'7" would be in the mid 170's range IMO. Worst case scenario, you demo a few sizes and see what feels the best to you.
I have Moment PB&J in 162cm (bit too short for my taste in big mountain but they're a dream in park and the next size up was too tall for me)
Armada AR7 in 168cm (big mountain/sometimes park skis)
Line Honey Badger in 166cm (specifically for park and big mountain)
Which skis were you looking at in particular? Cus I know some of them jump in size where the shorter one is "too" short but the taller one feels more your style.