Mactan Island is in Cebu (island).
Mactan is a small island right off the coast of Cebu City. Mactan Island is also where the Cebu International Airport is, so almost all travellers going to Cebu City will go through Mactan. The island itself is worth a visit, as it is less hectic than Cebu City, and has numerous beach resorts and beautiful diving sites.
Mactan Cebu International is also the main domestic hub outside Manila with a variety of flights around the Philippine archipelago such as to Manila, Kalibo, Puerto Princesa, Boracay, Clark (just near Angeles City), Roxas, Pagadian, Siargao (Surigao), Zamboanga, Davao, Bacolod, Iloilo, Cagayan de Oro, Cotabato, Camiguin, General Santos, and Tacloban, Masbate among others.
Visitors from North America, Europe, and the rest of the world may fly first to Dubai or Singapore or Hong Kong or Seoul or Kuala Lumpur or Tokyo or Taipei or Shanghai to catch a flight to Cebu. If you don't mind braving the horrendous traffic and the cacophonic noise of Manila, you will get a faster connection to Cebu, for there are now 28 flights daily between the two cities or almost two flights every hour. There are also flights to Cebu from Clark or Davao or Kalibo International airports, from which there are further flights on discount airlines to Malaysia,Singapore,Hong Kong,Korea and other points.
Facilities and amenities at the airport include a shopping center, duty-free shop, souvenir shops, cafés, business centers, food shops, communication facilities, banking facilities, car rentals, hotel and resort reservations, and beauty and health services. Grab and Uber apps are a great way to get into town or the ferry/bus terminals, since they offer a fixed price (expect P200-P350), immediate departure and skip the long lines for normal taxis.
Mactan island has some of the best scuba diving sites in the Philippines. It also has a number of inexpensive dive shops where you can get SCUBA certified and go on a number of dives. Most sites use the PADI course, although some teach RAID, SSI, or NAUI courses. Many centers also teach freediving, which is diving without oxygen tanks.