The speaker is bored at work on a sunny day and wants to escape the usual routine. The mood is playful and inviting: they suggest a seaside trip, a drive with music, and later a visit to the fairground. The repeated invitation makes the outing feel like something to enjoy together, though the question about what to do after sunset hints that the day cannot last forever.
Several images make the escape vivid. The melting ice cream suggests uncomfortable heat, while โrain belting downโ means rain falling heavilyโa contrast with the bright weather the speaker welcomes. โLeave this deskโ and call the trip โa protestโ turn skipping work into a joking act of rebellion. The โgrindstoneโ is an idiom for tiring, repetitive work, so not wanting to return to it means wanting to avoid ordinary duties.
The lyrics can be read as a lighthearted fantasy of taking a spontaneous day off, rather than a serious plan to reject work altogether. The speaker promises a shared good time, but the song does not say who the companion is or what their relationship might be. Its cheerful escape also carries a small tension: the sun will set, and eventually the work routine may return.