Hi, Larry,
I'm not trying to discourage you from taking this trip -- after all, I keep going back to walk a stage every chance I get! (hope to walk Azambuja to Santarem tomorrow in fact and I'll let you know). Some of the towns, like Alhandra and Alverca and Vila Franca da Xira are very pleasant, nice architecture, good rest stops. There are pretty stages along the river, too, from Estacao do Oriente (where it sounds like you're planning to start) to Sacavem, and then from Alhandra to Vila Franca da Xira. If you haven't seen my pictures from walking the first couple of days, here's a link
http://picasaweb.google.com/laurie.reyn ... Dxipep3Vo#
And details on my walking are here:
el-camino-portugues/topic5398.html
Some more random comments:
-- If you look at the Gallego Amigos guide that's in pdf form on their website, you'll see lots of pictures of earthen trails, so I assume I'm going to find them at some point.
-- I can't imagine riding a bike from the Lisbon airport to anyplace. Do you have details on how you are going to do that?
-- I've walked the days from the Spain-Portugal border, and that stretch is beautiful, great accommodations, etc.
-- I think that south of Porto you are likely to be pretty much alone, and you're going to have to rely on private accommodations unless you take the Volunteer Firefighters' option. But the yellow arrows are everywhere!
Laurie