Among other selected national team players, he participated in cultural exchange football activities between the Philippines and the former Soviet Union in 1983.
[3] In 2014, Guarin joined other select coaches of the Philippine under-11 team at Loughborough University in England where the underwent training.
[2] On January 10, 2015, Guarin was elected as president of the then-named Cagayan Misamis Oriental Football Association (now the Misamis Oriental Camiguin Ginggoog El Salvador and Cagayan de Oro Regional Football Association[4]) succeeding Ismael C. Batiles who served for 8 years.
Among his most noted projects is the "All Heart for your Dreams" program which involved collaboration with sports associations in the city, the conduction of football clinics for children for free, and the scouting for new talents.
As part of Guarin's program, the Cagayan de Oro football center, the Liga Estudiantes, and the Mindanao 1 Futbol were established and the project "Happiness" was launched.