Just caught up with Yotsuba&!

 

Yup, this is an ongoing series. Volume 16 gets 5 stars from me. 

Yotsuba spends most of this volume on a hike with her dad and one of his friends. We also see her next door neighbor Ena's teacher for the first time, who is none other than Osaka from Azumanga Daioh (both series are written by the same author).