Swimming in the mud was unlike anything we had experienced before, and was well worth the trip. You climb up a steep set of stairs then climb down into a pool of mud. There are people to hold your belongings at the top and take pictures of you as you are climbing down and in the mud (for a tip, which you give at the end). We spent as long as we wanted, although the pool got quite busy after us and there was a line to get in (get there early! 8:30ish). You will then be washed off by women who will clean your suit in the river, but the water is cloudy enough that you can't see anyone.
I would have rated the trip a 5 Iif it were not for the issue of tipping. Everyone will come to you at the end and request/demand tips. It is not an issue of expense (we were happy to provide fair compensation); however, it is confusing to have many people asking for money at the end (with a group). Pay attention to who provided services for your group and bring lots of small bills (1000, 2000, 5000 pesos) because you cannot give one tip for the group. It would be much easier if there was simply a higher single fee.
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