We enjoyed the day trip to Sintra a lot. Our bus was air conditioned, which was great, we had like 30 people along, some speaking Spanish, some Portuguese, and others English. Our tour guide did the best in Spanish and Portuguese. We noticed that the explanations for things seemed ro be much more detailed and lengthy in the other languages. When she switched to English, we got a few sentences, with empty words like, "nice, interesting, etc." Fortunately, Sintra and Pena castle are so lovely that you can figure out things on your own. Would have loved more time at Pena Castle, just to look around. Lunch, which was at a hotel in Sintra, was so-so. Unlike what other people have written, you get orange juice (more like watered down Tang) and cold water with your meal. We stuck with that, so we incurred no additional charges. If you want a Coke, beer, etc. then you will have to pay for it.
So we got what we came for, seeing the castle and Sintra, but they could do better with the group leader/translator's skills in English. And given that more than 1/3 of the trip had Americans on it, that should be a priority.