Taiwan

Ok, ive been having quite some trouble with this one.....i pardon for my ignorance, but i still cant figure out what this card EXACTLY represents....hence I labeled it with Taiwan only

Lets see....it somewhat reminds me of those underground railway maps, by its concept.
Now, on the front, the card says Kaohsiung, Taiwan...below it says "Chi Chin Working" ?!!!
The sender of the card says she couldnt have big size postcard of Kaohsiung city, so she sends the Chi Ching bigger postcard...that Chi Chin is near Kaohsiung, and if she wants to go to Chi Chin she must pass some tunnel or ferry boat...she mentions some sea food and sea activity....
Frankly, im lost....
The card shows some pictures named as eg. Tienhou Temple, Seafood street, Harbor Ship....Three-wheel (?), Chihou Lighthouse, Beach Resort, Roast Squid etc....now, from what I think, this might be like a map and the pictures show certain places of where they are located...but im not sure...and im still confused what "Chi Chin" is...and what that 'working' added means?....i came across something while googling which makes me think that Chi Chin might be some district in Kaohsiung, but then im confused coz the sender says she has to travel from Kaohsiung to Chi Chin, so it makes them two different places....uhhhhhhh, i need Taiwanese help here........sorry, but i really cant figure this out :((((