You can follow this routine.
Day 1- Your Home to Chopta.
Day 2 - Tunganath and Chandrashila Trek. Can be done easily in a day. Get back to the camp/hotel before dusk.
Day 3- Visit Sari Village and go on Devariyatal Lake Trek.
Day 4- Back to home.
Leave from delhi (assumption) on froday night. Reach chopta by 4 ish. Relax and acclimatise to the weather. (saturday)
Start you trek by 8am in morning (sunday). get some food packed for lunch which you will next to entrance of the trek. go to Changrashila as well, if possible. come back the same day.
leave for home ( the next day, monday)
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To visit Chopta Tungnath first thing you need to do is stop worrying because routes are very well connected unlike other hill stations. So lets do this.... Day 0: Delhi to Rishikesh overnight travel you will reach rishikesh early morning. that';s a good thing thou. Day 1: Rishikesh to Rudraprayag You will find ample of buses going from Rishikesh to Rudraprayg. 200 INR Fare. It will take around 3-4 hrs to reach Rudraprayag. Once you reach Rudraprayag board a bus or shared taxi to Ukhimath. 100 INR fare charges till Ukhimath. Either stay at Ukimath in evening there are many good and cheap hotels to stay at 700-1500 INR room rent. But if you have time you can hire a taxi to reach Chopta the same day. It takes exactly 2 hrs to reach chopta it is only 30kms from Ukhimath. Once you have reached Chopta there you can find camps to stay at night and small hotels at cheap prices. Enjoy there next day go to Tungnath and Chandrasheila. Enjoy walk in nature on Badrinath Highway in Chopta. This will consume your Day 2. Day 3: Wake up have some breakfast. hire a taxi and go back to Ukhimath. From Ukhimath you will get buses or shared taxis to Rudraprayag. From Rudraprayag again you will find plenty of buses and shared taxis going to Rishikesh. If you do not find direct bus to Rishikesh go to Srinagar from there you will easily get buses to Rishikesh. From Rishikesh board a bus to Delhi. Day 4. You are in DElhi back at home.