(Not a Teacher)
First Sentence -- What you've written is ok, but this is a more common way of expressing it:
"I hate making trips to Taipei."
"I hate trips to Taipei."
Second Sentence -- Perfectly fine. I would use 'there' instead of 'Taipei', since you've already established what city you're talking about.
Third Sentence -- I've rearranged this sentence so it flows more smoothly:
"Also, everything is so expensive that I can't afford to go shopping there."
Fourth Sentence -- It's all right grammatically, but the reiteration of your first sentence hardly seems necessary.