When I came here 7 years ago, I soon saw that the price of property, especially relative to rent, made no sense. Always had a feeling that Taiwan has never had a huge interest rate rise or a huge market crash , being quite insulated .
IF you ever wanted to move and rent out your property , Taiwan has one of the lowest Price/Rent ratios in the World.
However, prices have continued to rise and I would have doubled my investment or more , had I bought then.
Most coastal areas are too windy and also can suffer Typhoons, so the locals prefer the City life.
Some friends looked over the whole Island, trying to find a Plot or house with “sea views” but after 2 years , gave up .
Land around Kenting is owned , predominately by er…dubious people which can complicate matters.
Thailand and the Philippines make more sense financially, also having the beaches/property you seem to be looking for.
That being said , Taiwan and it’s people, I have always found to be great ( with the odd exceptions) and I like the very low level of crime . The place grows on you over time and the Medical facilities are wonderful.
The food is terrible if you are used to Western food, Do not believe all the positives you read, I have eaten all over the World and that is my opinion only based on experience.
The language is quite a big issue if you don’t speak Mandarin but it can be learned.
I really don’t wish to sound negative as i still like Taiwan but from the little information you posted and being British also, I would check other places and compare.