Are you going to use public transport or your own? You can roam around conveniently if you have your own vehicle because buses timings are a bit odd and not frequent. You can cover Manikaran gurudwara, camping, there is bridge and an hour trekking to a village (you can go in the morning).. IF you are fit you can go to kheerganga trek, but in monsoon, don't risk if you are a beginner with normal shoe.. Its risky. If not kheerganga, stay in tosh for one day. It is a different experience.
If you have completely 4days in your hand for Kasol, then it's possible to cover those areas. Start your journey by 14th Aug evening. You can take bus to words Manali from Kashmiri gate or HPTDC house. You have to getting off at Bhuntar, then take local bus to kasol, will take 1hrs approximately. on 15th Aug : After reaching Kasol book any hotels or homestay as per your budget. Then go for Chalal Trail and Manikaran. 16th Aug : Take Local bus to Barseni. then go for Tosh, Spent a night over there..
17th Aug : Go for Pulga. Will take 4-5 hrs approximately ( By walk). Spent a night over there..
18th Aug : Return to Barseni, then take bus or share taxi to Kasol. Spent whole day over there and on evening return to Bhuntar and take bus to Delhi.
( Otherwise you can go for Kheerganga for 16th to 18th) Then back to Bhuntar and take bus from there..
It's gonna rain around that time. Plan your travel around September end or October. I had visited in October, two years ago. Also, 4 days are enough. Delhi to Bhuntar and then book a cab from Bhuntar to Kasol. Camps are available easily - The hotel or home stay guys can arrange for you.
Hi Sahil , Thats good u r planning for kasol. and yes kasol can b done in 4 days. u can find many camps there. i ll suggest u for parvati wood camps kasol. they offer many type of campings with good food. if u r a trek lover u can trek to kheerganga most famous treck in kasol. Or u can treck to grahan village also. datz a hidden gem of kasol. both trecks are two day plans. must visit places are local kasol market , manikaran , tosh village . overall kasol is heaven in mansoons. so enjoy your trip