To linger longer at Salto del Laja, check into Los Manantiales, a popular budget hotel with a large restaurant that has spectacular views over the falls. Wood-paneled rooms are spacious and clean, and the decor of the whole complex seems gloriously unchanged since the 1970s.
There's also camping if you happen to be traveling with a tent. Regardless of what the signs at the entrance say, it's a good 1km (15-minute) walk along the winding access road.