Thanks for recommending OPA Tours Greece in "Tours and Cruises" (Jan. 17). However, we decided on one of OPA's other tours. It was marvelous in every respect, and although we have done quite a bit of traveling on our own and with various tours, this was far and above the best. The itinerary, the tour guide, the tour coordinator were incomparable. Even the price was wonderful. We have paid much more for much less.