We took two vehicles. We dropped the first vehicle off in Boston. There is ample parking in Boston. Then we drove the second vehicle with the kayaks to Buena Vista. It is a 10 minute drive between Boston and Buena Vista. We put in at Buena Vista. There is ample parking at Buena Vista, a large area for unloading your boats and a concrete ramp for launching.
The river was very swift at it's center in Buena Vista but calm and easy on the side where the put in is located.
From Buena Vista to Boston it is about 8 miles on the water. The Coulter take-out is at the half-way point. Buena Vista to Coulter is 4.1 miles. Coulter to Boston is 3.9 miles. The river on this stretch is much wider and deeper than the river up in the Dawson or West Newton areas (which are very shallow). At first, my 84" paddle could touch bottom but shortly afterwards it got too deep to touch bottom. Traffic on this section of river was very sparse (especially considering it was Memorial Day). We saw no other kayakers. We saw a handful of fishing boats, pleasure boats and jetskis which is another big difference from up-river where it is much too shallow for this type of boating. There is not a whole lot to see on this stretch. The river is wide with some scattered houses (more towards the Boston section) and little wildlife.
It was a short paddle - only 2 - 2.5 hours with minimal paddling.
The Boston takeout is impossible to miss (there's a big bridge there!) on the left. There is a small concrete take-out ramp but it's steep so you need to come in from the side with your kayak.
Overall it was a nice trip but I prefer the more beautiful floating up-river in Dawson.