[i_am_proteus]

No Target, but there's a very good Kmart! Plus, anyone with a military connection has access to the exchanges, which are effectively tax-free Targets.

Most of the domestic tourists I saw around Guam (I was stationed there for a stretch) were divers. I don't know that I'd recommend it for the average non-diving traveler over cheaper-to-get-to alternatives unless it's someone who's specifically looking for the remote character of Guam (and in that case, there are less developed islands that can be gotten to more cheaply).