Our favorite mid-range hotels in La Fortuna are San Bosco and Monte Real Hotel. Both hotels are located near the center of La Fortuna with their own swimming pool.
Nearer to the volcano the Arenal Lodge has great views of Arenal looking out over a forest. From about USD75 for a standard double to USD150 for a suite or chalet with kitchenette.
The Montana de Fuego Inn has varnished wood cabinas and the junior suites have A/C and minifridges and some have great views from the porch to the volcano.
The best lava views are currently from Arenal Observatory Lodge or from Linda Vista del Norte in El Castillo.