Hiking boots-or trail runners for my way Europe tour

I love hiking and backpacking, and basically never wear dedicated hiking boots any more. My last big trip through Glacier NP was just with some $40 tennis shoes from Zappos. My perspective would be to plan to wear whatever you're most comfortable walking in (sounds like the trail runners), and check the weather closer to your departure. If it's looking very wet, you can decide whether or not you want to bring goretex / boots / etc. (this is assuming you may already have worn-in boots, because it is no fun to try and wear in new ones on a big trip!).

I wear Ahnu waterproof hiking shoes that I purchase from REI. I love these shoes. They are comfortable, not heavy, and I've accidentally stepped in a deep puddle before and stayed completely dry. I'm on my feet most of the day at work and will often wear them there as well.

I have taken that tour. It's fabulous! I'd go with the trail runners, no question.

You can always buy some gore-tex trail runners. That is what I use for my light hikers now here in Colorado.

I took this tour last year (loved it) and alternated between my Keen and Teva hiking sandals because that's what I'm used to wearing at home. My husband wore his water proof trail running shoes.

I would take goretex boots

I wore Keen and Merrell hiking sandals on this tour a few years ago.

Anything that isn't a dedicated "hiking" trip won't need hiking boots. Trail runners will work for the trails you will take. If it snows, probably the only time you'd wish for heavier boots, they'll close the trails anyway.