Hi Spice!
As alluded to in the other threads I'm going to Ahr Valley too, so I might be able to give more advice in a few weeks rather than now! From what I have researched though -
-Group size tends to vary a lot but there are 30 going on the Ahr Valley trip in a few weeks. I think it sold out so I imagine that'll be the same for the other Ahr Valley trips.
-I'd imagine walks would be at a relaxed pace even though the terrain might be tricky. I think there are breaks so people can keep up.
-I think for the Ahr trip all the excursions listed are included. I think any that are listed as "optional" you have to pay for - some optional ones are listed for some tours. Apart from that everything on there is included in the price.
Hope that helps at least a little~