You can obtain permit at police check post. PAP is issued. With this permit you can travel till Thangu. You need to carry 2 passport size pics, voters Id or DL. No Aadhar card. You will get shared taxis, local buses until a point. If you are planning travel around Sikkim better to book a travel car. Check with travel desk in the hotel you are staying, else check with justdial. is another site to check.
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Ok great. so it's possible to get the permits while we are there right?