Would I be able to visit universal studios and island of adventures in one day or would it just be best for me to do universal studios one day and then come back the next day and do island of adventures?

Sure can. Be there when they open and leave when they make you...agree with if the lines aren't bad it will be easier.

Yes you can do it one day enjoy

1 day🙂

Yes, why not?

If you only want for one day you would just see the highlights in each Park there's simply no way to do it all in one day

You can do it all in one day when the lines aren't bad.