Also known as Xieng Khuan, the park was started in 1958 by someone named Luang Pu. He was a priest-shaman who integrated Hinduism and Buddhism and decided to place 200 odd hindu and buddhist statues in a park right next to the Mekong River.
They range in shapes and sizes, and although there isn't all that much in terms of explanations, etc, it is still a remarkable collection of deities and religious sculptures. Some might say it's tacky, but I thought it was well worth the visit.
There is a bus stop right in front of the park, and believe me, it is hard to miss. The statues are massive and peep above the trees and people in Thailand across the river, can even see them on clear days.
It is a popular place among tourists and locals and if you bring some food, a wonderful place to have a pick-nick. There is a cafe serving Laos food and drinks, and you will also find some souvenir shops and merchants selling snacks at the park's entrance.