Try everything.
Do not skip the beer or the cider, personally I find both of them better than their mead (heresy, I know). The lemonade is good too if it's open. Of their meads, I like the raspberry the best, though I haven't had the Melia or Mead of Poetry which I assume would be awesome.
They also do floated mixes of cider/cider or mead/cider which are really good. The lemon/raspberry or lemon/cherry cider mixes are good, and the raspberry cider/mead combo is also good but lacks some of the fun color separation effect.
The Hel beer is the best thing they have though, IMO. It's basically a braggot, I think about 10% abv.