(a) The poet wishes to go down to the seas at dawn, as indicated by the line:
“And a grey mist on the sea’s face, and a grey dawn breaking.”
(b) The poet prefers a windy day for sailing, as mentioned in the line:
“And all I ask is a windy day with the white clouds flying.”
(c) The poet prefers to hear a merry yarn (a cheerful tale or story) from a fellow rover, as stated in the line:
“And all I ask is a merry yarn from a laughing fellow-rover.”