The Church is Adorable. The trail is short, paved, and well maintained. You can take your dogs but are expected to clean up their poo. They have little poop bags attached to each bench. It was cool to see once but not really a place to hike if that's what you are in to.
I never did locate the actual trailhead for Blowing Springs. Instead, I came across an access point for the Back 40 trail, which, lucky for me, eventually joined up with the Blowing Springs trail. These trails are haphazardly marked and, as is typical with heavily-mountain-biked areas, have lots of little, un-official spurs and branches. It's a bit frustrating, but a pleasant walk nonetheless, provided you don't mind wandering a bit. We ended up a bit off on the way back, and ended up using the "where's my car?" feature of my driving app! Came out a few blocks from where we'd started on a residential side street, no big deal.
The trail map, available from a city-sponsored trails site, is almost laughably useless.
The lower trail, which runs along the bottom of the bluff line, and along the spring for a while, is really lovely. If you can manage to very carefully plan this out, and then also stay on your desired trail, this would an excellent hike.
It's a nice trail, but that's considering that this is NWA, where there are people pretty much everywhere you go. My biggest complaint is that no matter where you go on this trail, you can't escape the noise of constant traffic. That considered, it's a pretty trail with a gorgeous, swimmable creek along the way. It's definitely family friendly and has a decent playground that intersects with it where you can stop and let the kids plays. Lots of areas for a picnic or to stop and play frisbee. Bonus: there's a little cave that you can climb up to and explore fairly easily. Overall a pretty decent place for a good walk.
Even though it's predominantly a bike trail, it's definitely an enjoyable hike. The trails are completely shaded, so it's a good choice on a hot day. Lots of interesting rock formations, several small caves and decent elevation changes keep it interesting. Only saw three other people. The trail is well maintained. Hiked 5 mi and didn't see one piece of trash.