There is no established Jewish presence in Laos. Laos is a communist country that has just recently become open to foreign tourism. Chabad Lubavitch secured permission to establish a permanent presence in Luang Prabang in 2006 but has since closed because of government problems. I believe that the Chabad of Thailand organizes a Pesach seder in Laos but you need to check from year to year.
I was there in 2001. The people were extremely welcoming but many were shy of interacting with tourists because they feared they were being watched by communist officials.
There are no Jewish attractions but many beautiful natural and cultural sites. One of my favorite memories is floating underground down a river. I sat on tire tube holding a candle. It was magical.