Drive from Chiang Rai first to Chiang Saen (Hotels Chiang Saen) a peaceful tourist attraction, with lots to explore. The Town offers a charming and serene atmosphere on the banks of the Khong River, at the three-country border between Laos, Burma (Myanmar) and Thailand.
Than proceed to Chiang Khong to the Chiang Khong pier (Hotels nearby).
From Chiang Khong pier you need to pass the Thai immigration before boarding a ferry to cross to Houei Say immigration office in Laos. From here, look for a Lao-style tuk-tuk to Houei Say pier to board a boat to Luang Prabang (Hotels Luang Prabang).
Asean tourists do not require a visa to Laos. The immigration office in Houei Say provides visas on arrival for tourists from other countries.
From Houei Say pier you can take a slow public long boat to Pakbeng (Hotels Pakbeng). From Pakbeng you board another slow boat to Luang Prabang the following morning.
