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).
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).