The area around the Meeting of the Waters Park, accessed via Porto Jofre, has long been a haven for sport fishermen and now the fishermen and the ecotourists are fighting for the limited accommodation space that is available. The best hotel is often booked well in advance by the fishermen, so that leaves lesser alternatives. There are a few basic camps and a very simple hotel nearby. There is another lodge that is down the river and yet another that is about 40km from Porto Jofre, so it is about an hour drive to go each way, to and from the river. It is also possible to stay on a boat. A brand new jaguar cruise boat has started operating this year.
The Caiman Ecological Reserve has also developed a good program for seeing jaguars and for being educated about them. They do have regular sightings of jaguars there during high season, though not every day.
The best time for trying to see the jaguars is when the water levels are low. Then you can see them come down to the river to drink and hunt. When the rivers are up, they don't have to come out in the open. So around June or July to October is generally a good time.