Well, sometimes I skip the half day of sightseeing in favor of a few hours in a cafe. Or two. ← I stick to the morning to "do" museums, sites,etc. I've learned the two-dish tango for eating out in Paris. Either an entree/plat or plat/dessert, with wine, of course. That way I can do two nice meals a day without "hitting the wall". Afternoons are more free form. However, I have discovered splitting a bottle of champagne after that post-prandial walk does tend to wreck the rest of the afternoon .