Kasol is a good destination for solo travelling. You can trek to kheerganga , tosh , malana.
You can plan this:
Day 01: Kasol visit with Local Sight Seeing like:New Kasol, Chalal Village, main market of Kasol
Day 02: Kasol – Barshaini – Rudra Nag – Kheerganga
Day 03: Kheerganga – Rudra Nag – Barshaini – Kasol
Kasol is located in Parvati Valley and a great spot for solo travellers. You can easily find amazing and budgeted stay options, small eateries and cafes and reach there by Volvo/ordinary bus from Delhi or nearby major cities.
Planning to go solo? Go with a proper information about the place, where to stay (reviews) and where to eat. If going for a trek to Kheerganga or any other hike, always go with a local guide. Plan your trip using following travel guides.