Guam is a dump. Sorry Guamsters but it's the truth. Great for a launching point, but it's a tiny island. If you overturn every rock there, then you'll see everything in 5 days, otherwise one day is enough. And to even think you would consider Guam for a week to Hawaii!! Biggest joke ever. A ton of gigantic outlet malls for the asian charter flights. And the chimorros definitely do not like the Americans there, especially when the marines all rolled in there a few years back. Too much testerone chasing the few chimorro chics. Yeah, and you'll have some old timer L-CAL guys telling you how great it WAS. It WAS, but is no more. Go to Palau and the other islands for the best diving and sightseeing and get away from the hordes of asian tourists that have nothing to do on Guam, except shop and hang at their so-so resort. I would say, don't even waste one day in Guam, and this is coming from someone that travels the world extensively.