The Radway for English tunes. I'll be there some of the time.
The Bedford for different sessions depemding on who's there (as far as I can tell)
The Volunteer for lunchtime singarounds, very traditional and mostly unaccompanied, packed out and you need to be known by whoever's hosting it if you want to sing.
The Anchor for the famous Middle Bar Singers' Club (that'll be the one with the 'no instruments' rule, and there are other arcane observances of this cult-like event.) Good for rowdy chorus singing.
The front of the Anchor for Irish sessions sometimes.
Much busking of all sorts all along the sea front..

Also...
If you can make your way to Sidbury, the Red Lion (run by an ex Holt Morris man) is keen to encourage music, dancing and singing, and as Mary and I are staying there we are intending to host sessions on Monday, Tuesday and Thursday (i.e. we'll definitely be there on those nights, whereas we have committments on the other nights). We expect a mostly English mix of tunes and songs.

Anahata
(Turning into a Simouth addict again. I can hear the seagulls and smell the seaweed, fish and marine diesel fumes already)