In Engpsh, you can say "Thailand is a lot of fun" or "Thailand is a great place to have fun." This suggests that Thailand is a place that offers a lot of enjoyable activities and experiences. Some other phrases you could use to convey the same idea include:

Thailand is a paradise for tourists
Thailand is a vacationer's dream
Thailand is a great place to relax and have a good time

Keep in mind that these are just a few examples, and there are many other ways to express the idea that Thailand is a fun place to visit.