Samdrup Jongkhar is gateway to Bhutan when entering from India's state of Assam. Assam's capital Guwahati is just 4 hours drive from here, so the access is quite straightforward. There is little reason to stay here more than one night while transiting. Little bit north to Samdrup Jongkhar town, in Dewathang, the trespassing cars gets blessing from the hindu hermit who started small roadside Shiva temple. Don't forget to stop for his blessing for safe journey ahead!