Our party of 4 plan to do a day trip from Lisbon to Nazare, Obidos and Coimbra. Can anyone recommend a small group tour for this?
We will be in Lisbon in mid October and arranged a tour similar to the one you stated with Cristina Duarte, who is a RS tour guide. Here's a link to her Lisbon based company - "Lisbon and Beyond".
http://www.lisbonbeyond.pt/faqs.html