Been doing nothing but farming for Korok seeds the last couple of days. I'm over 1/3 of the way there and have the entire upper left corner of the map cleared but there are still hundreds to find. I'm enjoying it a lot even though I've had to use a guide to find where they are. I'd honestly be at it forever if I didn't use one though and it also shows me where shrines are. I'm up to 87 of those.
At the moment I'm trying to get the Lord of the Mountain to appear so I can add it to my compendium. I'm not concerned with catching it for a mount as I have Epona instead. Going to continue searching the upper right of the map for Korok seeds after I find it and then start working my way south and clearing everywhere around Zora's Domain and then towards Gerudo Desert. I wish the Korok seeds showed up on the map without having to zoom right in. It would make it so much easier to keep track of the ones I've found since I can't stamp them as I use those to mark the locations of ones I've yet to find. 100 stamps also isn't anywhere near enough when hunting Korok seeds.
You can't register the Lord of the Mountain anyway. As with everything else that's not a horse.