keep queues short, the more people you have in line, the less people spend at shops. the longer a line is, the more complaints you get about thirsty or hungry guests. If you owned your park in real life, you would want people spending money at shops (in real life parks make money on shops, but in the game shops are not as profitable as rides) plus when a ride breaks down you get less refunds [wink]
it also depends on the ride, most flat rides i would say only need a line thats long enough to fill the ride up once, so if the ride carries 20 guests you dont need more than 20-30 guests in line. Track rides are different, slow car rides should not have long lines because guests will wait forever, but coasters can have a bit longer of a line cuz they generally move faster [up]
also fast pass is kind of a waste (IMO) its just more unnecessary work [tongue] use this guide for pricing instead
https://steamcommunity.com/sharedfiles/filedetails/?id=877268657