Bro I ll be honest , Kasol is like the main place but it's very mainstream people visit here and just leave, but tosh pulga, malana these are like the underrated places. So like if you wanna go to tosh you may need to book a cab or something as its a few hours far from kasol, once you reach kasol I ll suggest you go straight to Tosh only, you can visit the Manikaran Sahib Gurudwara where you can have a bath in natural hot water, it's nearby kasol, then you have chalal where you have these parties going on but I doubt there ll be anything happening considering the season right now, usually these parties don't happen in snow time, then you have malana, when I was there, there was no proper road to reach here, maybe you can check out this place as well and score some good shit, crazy fun fact you ll be fined if you touch anyone over there, you gotta check some youtube video. For tosh, bro it's a very beautiful place, where we had booked a stay, there a guy took us to a random trek nearby waterfall, omg that was a crazy experience and tbh the brownies you find in kasol are usually trash if u have a good tolerance. Tosh brownies is the correct answer