Boat trips, whether by small motor boat or in canoes, to observe wildlife are offered in many parts of the park.
There are also short and medium length hiking trails at several of the park entry points and horse riding is also possible.
Swimming in any of the bodies of water in the area is not advised because of the presence of piranhas – which while they won't devour you entirely like in the movies – can give a nasty bite. Locals say as long as you keep moving you shouldn't get bitten.
The greatest concentration of accommodations in the greater reserve are in Colonia Pellegrini where the hotels either border the estuary or are just a short walk away. There are several charming more isolated rural properties adjoining other areas of the park.
If you want to spend the night inside the park boundaries you can pitch a tent at the visitor's center at the Portal San Nicolas or spend the night in the traditional refuge or in the nearby community at Portal Carambola.
Most hotel options around Iberá offer meal services for guests.