Since you’ve already got one tree, sink a 4x4 post in concrete (or just bury it if you want less permanence and like to live dangerously) to use for securing the other end of a hammock (with one end wrapped around the tree).
The post can serve double duty too - you could use it as a tetherball post (better to use a metal fence post in that case though? Or do they make dedicated tetherball posts), for either you or dogs.
As of right now, the button is just a toggle that will turn on the feature to hide read posts in your feed, but won’t restore hidden posts (as you found). If you want to see your hidden posts, you can go to your profile (center button on the bottom buttons) and you can unhide a given post from the post itself.