This is the day that makes sense of the poetry, and it works in the rain — which on this coast is worth a great deal. It follows Burns backwards: first the village where he met the men who became his most famous characters, then the village where he was born and where the poem is set, then the county town he wrote about.
It is also the easiest full day to do without a car, which is unusual for a rural itinerary. See the note at the end.
Notes on the stops
Kirkoswald is where Burns spent the summer of 1775 at the parish school, and where he met John Davidson the village souter and Douglas Graham of Shanter. Souter Johnnie's Cottage, built by Davidson in 1785, has been free to enter since 2016; opening is seasonal, roughly late March to the end of October. Across the road, both men are buried a few yards apart in the old kirkyard.
Alloway is the heart of the day, and the pricing is worth understanding before you go. One ticket covers the Robert Burns Birthplace Museum and Burns Cottage; the Auld Kirk, the Monument Gardens and the Brig o' Doon are free to anyone. If your interest is Tam o' Shanter rather than the collection, you can walk the entire landscape of the poem without paying. The Poet's Path links the museum to the cottage in about 500 level metres.
Ayr finishes it. The Auld Brig of about 1470 is the bridge from The Brigs of Ayr; the Auld Kirk off the High Street is where Burns was baptised — and is a different building entirely from the ruined one at Alloway, which trips up almost every visitor. Add the beach and Low Green if the weather is kind, or Rozelle's free galleries if it is not.
Doing it without a car
Stagecoach service 60 from Girvan stops at Kirkoswald and runs on through Alloway to Ayr, and the train back from Ayr to Girvan takes under half an hour. That makes this a genuine car-free day: bus out, walk between the Alloway sites, train home. Check the bus timetable, as services are roughly two-hourly and thinner on Sundays.
If it rains
This is the wet-weather day, so lean into it. The Birthplace Museum is a modern indoor museum with a café; Ayr has the Astoria cinema, the Gaiety Theatre, the free galleries at Rozelle and the shops. The one thing to skip in heavy rain is the Alloway Auld Kirk, which has no roof.