Group jungle trek in Chiang Mai

I'm looking for some 2 or 3-day jungle treks in Chiang Mai (preferably 2 days). Since I'm traveling alone, I would like to join a group and not have a private trek on my own. I already kinda have a plan for an elephant visit (which I trust), so I'd rather have a jungle trip without elephants (except if you know it's one where it's known that the elephants are treated well).

I found some jungle treks like this barking gecko trek. But the site reads it's private tours only. So any idea which are group jungle treks, instead of private jungle treks? (This is something I'm really looking forward to.)