If you're hungry, I'd recommend bringing something with you. Also, unlike most other US flights in F, they rarely offer you anything more than coffee, soft drinks or water on the shuttle flights before (I think) 10am.
I have been known to get a bloody mary on some of these flights, but usually it requires one FA asking another if it's OK.
It is a very short flight, though you do get to see a lot out the windows if the weatehr is clear, and I always find the approach into LGA interesting sightwise.