Travel adaptors: most airport shops sell them (well, maybe not Guam!).
For 13 amp we have 3 pin (flat thick prongs)plugs and for smaller appliances (lamps etc) some houses still have small 2 round pin sockets. I've got an adaptor that had multiple settings, OK for US, Greece, NZ which all have differing styles of sockets.
Shaver sockets here are usually dual voltage so "foreign" shavers work OK.
RtS