Sinsk is certainly out of the way. I was there in 2003, so I don't know what's changed. No hotels, no guest houses. Just go and surprise the hell out the locals, who are very friendly, and find out what life in (reasonably) remote Siberia is like.
Get there by river (fast or slow boat) and go to the local Posvet building, or general store. It's a good bet they'll be able to find a place for you to stay for a reasonable price.
There is a National Park adjacent and ancient rock art to see, but really it's all about the locals.
Not for those without a basic level of Russian. NOTE: the boat lands on an island offshore, so be prepared for a night on the island before someone finds you, and be ready to get the boat back the next morning if they don't. I was kitted up for a five day hike so could wait a few days, but was found the next morning.
.....Say G'day to Uri and his son Peter for me.























