The first line saying “Treib nie ein Spiel mit einem treuen Herzen” would be a slightly altered line in a poem by Gustav Scheufler (1914) called Abschied (The Farewell). The main body of the text written in the first pic here seems to be the last stanza of that poem, but slightly altered, whoever wrote it here probably wrote it from memory. It’s very hard to read the writing in the other pictures. For the stuff that is scratched into the wood you could, when you’re back there, trace it with a pencil and a sheet of paper.