If you are going mid week when the parks shut earlier, I would have a quick snack at lunchtime then a proper meal in the evening, in the village or in one of the hotels, so that it doesnt eat into your precious park time.
We did a one day trip once and finished it off with a character meal at Inventions (a sumptuous all you can eat buffet) at the DLH, it was the perfect end to the day.