I ran out of room before I got to the food. We had some great meals. Our first full day we had a great lunch at Koetshuis de Burcht, right by the old fortifications in the city center. I had very good asparagus soup, and DH had an incredible veal tonnato sandwich. Huge and delicious.
Our dinner that night was at Ristorante Fratelli, excellent Italian food. We shared a very good 4 cheese pizza, as well as an appetizer of prawns in olive oil, garlic, and peppers.
The next day we had lunch in the den Haag train station, at the Seltzer Fish Bar. We were afraid one order of (very tasty) fish and chips wouldn't be enough, so we also ordered a bowl of asparagus soup (it was asparagus season.) The soup came in a big bowl, and had lots of ham (?) in it. We had enough food for 3 or 4 people, and it was all good.
That evening, we had dinner at La Plancha, a Spanish restaurant at the west end of the main canal, near the only other remaining city gate. We ordered the tapas platter, and it was all good. And definitely big enough for two.
Our last full day, we splurged for dinner. We went to Visrestaurant "Crabbetje," and did something we've never done before. We each ordered the four-course chef's tasting menu, and let chef recommend appropriate wines for each course. It was magnificent. After an amuse bouche of fish mousse, we each got a selection of four appetizers, the star of which was raw tuna wasabi. The next course was seared scallops with cous-cous; the main course was three kinds of sautéed fish served with a potato cake and good vegetables. Dessert could be either sweet or cheese; I opted for the cheese plate; Stan had chocolate mousse over cheesecake with a créme de cassis syrup. The cheese plate had four different cheeses and a bit of fruit. Very nice.
Other thoughts: since we were bracketing our RS tour with time in the Netherlands, we not only got the TripKey cards, we also bought 30-day museumkaarts as soon as we got to Haarlem. If you like mueums, the passes are a bargain. I haven't counted how many museums we visited, but we never had to worry about the cost. The only museum we visited that did not accept the museumkaart was the Escher. (Bummer, but the Escher was a must-see for us.)
We were very surprised at how easy it was to get around in Den Haag. The streets are wide and almost traffic-free, and there are handy signs for major sights posted at regular intervals.
Our overall assessment? Definitely all thumbs up. We had a great time, and would be glad to revisit Leiden and Den Haag.