So my flight has a 7hr delay and I'm wondering if I already checked in, if I wanted 2 do something outdoors wld dat b possible? Or do I hve 2 jus sit patiently n wait on flight

Yes you can you do stuff. But when you come back you have to go thru the security check again

Depending on if your flight is local or international, you can do whatever you please. However you will have to return to your terminal within an approved time (2hrs for local and 3hrs international) so you can go through security and be at your gate to board your flight.