One of the coolest things about SLO is the morros! Morros are volcanic plugs, essentially the tough necks of old volcanoes that remain when the rest of the volcano erodes away. Islay Hill is one of the morros K and I hit up all the time! It rises to 780′ and is a quick mile to the top.
You can actually make this a loop trail! With the bottom portion heading down through a park and bike path. Both sides have beautiful views of rolling hills.
It looks pretty green here, but this is January 2016. The colors change dramatically as the seasons pass on the Central Coast.