✔ 最佳答案
Check your ticket again. You have a week, not 8 days.
United Airlines, the only airlines, operates 2 flights (Monday and Friday) currently between Hong Kong and Guam per week. For those flights, you will arrive next morning of your departure. So if you depart on Monday/Friday, you will arrive on Tuesday/Saturday.
In answering your questions:
1. Go to the following website and see what you have missed:
http://www.visitguam.com.hk/index.php
Guam is not big. You have more than enough time. So most of the online information should cover everything.
The only issue is getting around.
2. Yes - flying is the only current option. For pricing, you will have to check with Freedom Air or United Airlines.