Do you mean for table service lunches? You'll probably need to reserve in advance for the day you arrive (Sunday), but the rest of your trip is midweek, so I think you'd be safe just booking them when you get to DLP, either at your hotel reception, or at City Hall in the main park.
We usually have counter-service meals at lunchtime, and you can't book for those. You also can't reserve tables in advance at some of the restaurants in the Village (Annettes, Rainforest Cafe off the top of my head).