Below is a list of the provinces of the Philippines, with places I’ve visited marked in bold. Map below courtesy of the wildly popular My Philippines Travel Level!
Abra
Agusan del Norte
Agusan del Sur
Aklan
Antique
Apayao
Aurora
Basilan
Bataan
Batanes
Batangas
Benguet
Bukidnon
Bulacan
Cagayan
Camiguin
Capiz
Cavite
Cotabato
Davao de Oro (Compostela Valley)
Davao del Norte
Davao del Sur
Davao Occidental
Davao Oriental
Dinagat Islands
Guimaras
Ifugao
Ilocos Norte
Ilocos Sur
Iloilo
Isabela
Kalinga
La Union
Laguna
Lanao del Norte
Lanao del Sur
Maguindanao del Norte
Maguindanao del Sur
Marinduque
Misamis Occidental
Misamis Oriental
Mountain Province
Negros Oriental / pt 2 / pt 3
Nueva Ecija
Nueva Vizcaya
Occidental Mindoro
Oriental Mindoro
Pampanga
Pangasinan
Quezon
Quirino
Rizal
Romblon
Sarangani
South Cotabato
Sultan Kudarat
Sulu
Surigao del Sur
Tarlac
Tawi-Tawi
Zambales
Zamboanga del Norte
Zamboanga del Sur
Zamboanga Sibugay