Yes there's plenty of parking

i am sorry to be so late seeing this question....I do not know the answer.

No they are not

Yes the room we were in had a connecting door

We visited in early January and the outdoor pool area was not set up for use, I assume the pool is not heated. They have a very nice indoor pool in the spa. I'd contact the hotel for activities although they do offer some outstanding, high-end dining. Staff is outstanding, you will enjoy your stay The resort is located close enough to the shore line to visit a beach and other attractions over looking the water. Like you, we were in Porto before Sintra and we stayed in Sintra at the end of our trip so we would be close to the airport. Sintra is within reach of Lisbon and many historical sites. I found UTube has some very helpful videos which gave us enough information to decide where to visit and offered some advice from those that travel more than I do. It also showed us what the local like which was great especially for food and drink. We had a rental car in Sinta and be aware that the roads are narrow and many are one way, makes it a little more challenging if you are not used to that type of driving. We tried to use trains or Uber as much as possible.