"para visitar" si esta correcto

por o para depends on the context you use them for example

the thing is that they are both used for the english word for

"para" usually is used to express many meanings

for example

im going to USA

yo voy para USA

para can also be used ofr the english word "by" or "for" to express an specific time, for example

i need to finish my homework for tomorrow

necesito terminar mi tarea para manana

para can also be used to express that something is for someone, for example

this gift is for you

este regalo es para ti

the word "por" igualmente peude ser usada de diferentes maneras

for example to express cause of an action

i fell down because of the snow

me cai por la nieve

it can also be used to express an author of a book or something

this book was made by orlando

este libro fue creado por orlando

also used to express means of transportation

i traveled by train

yo viaje por tren

those are some of common ways that "por" and "para" are used i think there are a few more

but as im native i really dont think about those they just happne automatically, as your spanish gets better you will be able to gain something called intuition

and you will know when to use por and para automatically too but that comes with time and practice

be patient if u work hard you will be able to learn anything you want