You can check out the routes I normally cycle down below. I will upload the GPX files soon so you can download them on your GPS head unit.

137.3 km Road Cycling Route on Strava
Gibraltar - Castellar - Jimena - San Pablo - Gaucin - Tesrollio - Via Servicio - Gibraltar is a 137.3 km Road Cycling Route created by Leigh Adnett 🇬🇮 on July 4, 2019. It has a maximum elevation gain of 1,667 meters. Sign up for Strava to save this route and share it with your friends.
Gibraltar - Castellar - Jimena - San Pablo - Gaucin - Tesrollio - Via Servicio - Gibraltar
81.2 km Road Cycling Route on Strava
Gibraltar - Pinar - Castellar Castillo - Las Cabaras - Gibraltar is a 81.2 km Road Cycling Route created by Leigh Adnett 🇬🇮 on July 2, 2019. It has a maximum elevation gain of 924 meters. Sign up for Strava to save this route and share it with your friends.
Gibraltar - Pinar - Castellar Castillo - Las Cabras - Gibraltar
110.8 km Road Cycling Route on Strava
Gibraltar - Casteller - Jimena - San Martin - Via Servicio - Gibraltar is a 110.8 km Road Cycling Route created by Leigh Adnett 🇬🇮 on July 1, 2019. It has a maximum elevation gain of 863 meters. Sign up for Strava to save this route and share it with your friends.
Gibraltar - Casteller - Jimena - San Martin - Via Servicio - Gibraltar
65.2 km Road Cycling Route on Strava
Gibraltar, Castellar, Manilva and Back Via Service Road is a 65.2 km Road Cycling Route created by Leigh Adnett 🇬🇮 on June 17, 2019. It has a maximum elevation gain of 563 meters. Sign up for Strava to save this route and share it with your friends.
Gibraltar, Castellar, Manilva and Back Via Service Road
21.5 km Road Cycling Route on Strava
Gibraltar to Castellar (Via Green Bicycle Lane) is a 21.5 km Road Cycling Route created by Leigh Adnett 🇬🇮 on June 17, 2019. It has a maximum elevation gain of 86 meters. Sign up for Strava to save this route and share it with your friends.
Gibraltar to Castellar (Via Green Bicycle Lane)
119.1 km Road Cycling Route on Strava
Puerto Galiz, Algar, El Bosque, Boyar, Palomita, Grazalema, Benaocaz, Ubrique, Puerto Galiz
Puerto Galiz Round Route