I had my first earthquake experience in Hualien. It was freaking scary!! When you sense an Earthquake, get out of your hotel and out to the streets. You might look funny but when the building comes crashing down, look who's laughing. Also, when you're in Taroka National Park, keep your ears alert for loud rock cracking sounds.
Don't let what I said ruin your ideal holiday in Hualien and Taroko. Because these incidents are very very very and I stressed very rare.
Although the scenery is very beautiful, be sure that you stand on a solid ground when you are trying to take a picture. Do not be too close at the edge of the cliff for taking a good shot of the picture. It happened that somebody felt into the river when he was trying to take a picture.
Be careful of the falling rocks when you are in the mountain area. Don't stop or park besides the cliffs where you can see the evidance of newly falling rocks especially at or after the rainy days.
Hualien has been known to get whacked by the occasional typhoon, (due to its location out on the east coast) so if you come during typhoon season, be sure to bring your wading boots...