I have a 5 hour layover in Miami what can I do that's close by in that time frame

In some gates you will have good options. In Gate G you will be stuck with a chair and bad smell, poor AC, and almost no shops.

Nothing, you need to be back 2 hours before your flight and by the time you wait for baggage 😰

I have near about 5 Miami do i need transit visa

Go to one of these special restaurant inside the airport have a nice meal relax and wait for your flight