I answered "don't worry about it" because DH and I (no kids) try to budget so that we can really enjoy ourselves. That said, I've been on Weight Watchers since last November (lost 93 lbs so far -- woohoo!) so we've changed our eating habits A LOT.
The last two trips, we've eaten a filling breakfast someplace that's sitdown, as breakfast has always seemed so much cheaper to us than lunch or dinner. Then, if we get hungry around lunch time we get a small snack -- fruit, dole whips, popcorn, ice cream, etc. On those days, we have a bigger meal later in the day -- we try not to eat all of these meals at fancy places to keep our expenses down, but we make sure we have at least 2 or 3 meals on each weeklong trip at really great restaurants. "Great" doesn't mean expensive though -- we love Nine Dragons and our meal with tip last time was around $30. But if we're not hungry at lunch time, we tend to eat the more filling meal earlier in the day, then get a snack in the evening.
I'm always on the lookout for great "deals" on food on these boards though. I'm more concerned about the money than DH as I'm usually the one paying for the trip (I have a travel saving account and do all the planning, DH is just "along for the ride" -- but he pays to keep a roof over my head the other 50 weeks of the year, so that's OK!), so I do tend to check out menus ahead of time if we're trying new places. But I always try to plan one fancy, blow-out meal each trip too! It's all about balance.
Another thing that helps with the bill -- we rarely order alcohol anymore. We both get sleepy if we drink anyway, so between saving around $10-$20 per dinner and being able to keep going longer, we really like the change.