The first part of this stage will be quite solitary as between Rocaforte and Izco there are no facilities. There is an alternative route through Lumbier but it goes more on the asphalt, it is considerably longer and you would have to pass through two tunnels. However, you would pass through two deep gorges formed by the River Salazar this way.
The official way is also a beautiful one nonetheless. In Izco you can find bars, a restaurant, a shop and even an albergue. The road from here to Monreal is quite easy.
In Monreal, the gothic bridge at the entrance of the village is quite beautiful.
This is the map for walking from Sangüesa to Monreal and also the alternative route though Foz de Lumbier. The camino will pass through: Sangüesa, Rocaforte, Izco, Abínzano, Salinas de Ibargoiti, Monreal, Liédena, Lumbier. See the map below: