If you’re aware of PIHKAL then you’re probably already aware of Erowid, but if not, it’s a good source for interesting subjective reports.
There is, its the first half of PIHKaL. It about the experiences and the society, not the chemistry. The second half of the book is the chemistry. Often in free dls they dont include the first half.
You can just read the subjective reports, those are interesting in their own right.
The first part of PiHKAL, written by Ann Shulgin, is also completely non-technical and is a spellbinding story. Highly recommended for anyone interested in the subject matter of the book, whether they know chemistry or not.