Nice way to spend a day, you can pre-book or on the day of our visit there were loads of people who had just turned up to pay on the day. The pricelist for the varying packages are clearly listed onsite, probably clearer than most sites.
We took a Grab, which cost very little, and had him collect us 3 hours later.
Warm mud baths for 20 minutes, enjoyable and long enough for me, after which there are numerous pools and waterfalls, slides, etc.
Most pools have a jet system to massage your aching parts. Also, one cold pool, which was funny as we being for a colder climate, welcomed it and had great entertainment watching people jump in and straight back out.
Good value for money and an enjoyable afternoon wandering from pool to pool.