Trekking Peaks are mountain peaks under 7,000 metres in height that can be climbed without any prior rope or crampon climbing experience. They are basically big hills that require no climbing experience, but all require physical fitness and perseverance due to their high altitude.
I especially recommend Mera Peak http://lamakarma.net/trekking-peaks/mera-trekking-peak/ as an adventure trek and Yala http://lamakarma.net/trekking-peaks/yala-peak/ for its ease of climbing and ease of access from Kathmandu. Most of them require trekking permits. As of May 2022, there is a list of trekking peaks and their permit costs on our page Other Trekking Peaks. http://lamakarma.net/other-trekking-peaks/