https://warontherocks.com/2018/10/hope-on-the-horizon-taiwan...
> The first phase is the decisive battle in the littoral, extending up to 100 kilometers from the island. Key capabilities at this phase will include sea mines, and large surface vessels equipped with Taiwan’s capable, domestically manufactured anti-ship cruise missiles, the Hsiung Feng 2 and 3. Taiwan’s surface fleet includes larger vessels from the legacy force, such as French-built Lafayette class frigates, U.S.-built Kidd-class destroyers, and U.S.-designed Perry class frigates armed with both Hsiung Feng and Harpoon missiles, as well as a new class of fast attack Tuojiang class catamarans that carry 16 missiles. Taiwan also fields anti-ship Hsiung Feng missiles mounted on trucks that will disperse in order to survive initial strikes. While evading detection in Taiwan’s urban and mountainous terrain, they will launch strikes at surface ships throughout an invasion.
> The second phase seeks to annihilate the enemy at the beach area, which extends approximately 40 kilometers outwards from anticipated invasion beaches. This phase calls for Taiwan’s navy to lay mines in deep and shallow waters off suspected landing beaches. A new fleet of automated, fast minelaying ships are being built for that mission. In the interim, mine-launching rails can be installed on several classes of surface vessels. While invading ships are slowed by mine fields, swarms of small fast attack boats and truck-launched anti-ship cruise missiles will target key ships in the invasion force, particularly amphibious landing ships carrying the initial wave of PLA assault troops as well as roll-on-roll-off vessels carrying follow-on vehicles and armor.
On top of that, hike along the west coast at any time. As you hike along mountain paths you'll stumble upon bunker after bunker.
A land invasion of Taiwan would quite possibly be the most painful land invasion imaginable.