The Groovy Grouper is the more expensive spot right in the arrivals area (outside) where the taxis meet people, with tables and a bar. Island Grill is in the departure area, inside the airport building and is fast food, thus fairly cheap. IG is outside security so you can hang there too but Groovy Grouper is closer to where your friend will come out. With 3 hours you could do both.

If you find you can store your luggage, go into MoBay (with a cell phone, ideally, so your friend or Kenny can tell you when to come back). If you can't, I'd say hang out at the airport.