Many readers were kind enough to offer tips about dining before our trip earlier this month, so permit me to offer some recommendations of my own, now that the trip is done.
In Amsterdam: the Convent Hotel is very nice (four stars), and has some fabulous deals (we got a room for two for under 90 Euros a night--booked it on-line--it's part of the Accor group of hotels). Rooms were small, but well-appointed and comfortable. Great location too, within walking distance of Central Station, Chinatown, the Anne Frank House, and even the Red Light district. The Van Gogh museum is very well-done, organized chronologically with informative written material to accompany the paintings. We only had one dinner in Amsterdam, and enjoyed it at Nam Kee in Chinatown.
In the Hague: the Hilton was fabulous, and I imagine rather pricey (the conference host was paying). And just across the way (on Noordeinde) are some very good restaurants: Bojangles (Spanish) and Maharani (Indian) were the two we enjoyed. The Escher Museum is fun, and nice for kids too. And, yes, one must go to Madurodam, the "miniature" Netherlands. Amusingly weird!