What about picnics outside? We do take our 13 month old to restaurants and make sure he's in a high chair with food or toys to occupy him. Mostly quick dinners. We make sure he has some 'excercise' beforehand, walk, play in playground so he can sit for a bit.
I prefer going out for home made picnics out in nice parks, on the beach. So it's ok for him to roam about while we eat. Also sometimes get pizza or fish n chips and have it as a picnic!