Pelikaan is an on island craft brewer, Blue Martini in GC served their Irma IPA (American IPA style) when we were there in November. Super U in GC seems to have a small selection of imported bottled beer, had a nice one from Corsica made with chestnuts (Biera Corsa Pietra) and they had a few Belgians as well.
Cheers,
Dave.