Dates are flexible. This day-by-day plan is provisional until you choose exact travel dates.
Start early at Sri Krishna Matha and see Krishna through the Kanakana Kindi window; queues are shortest early. A dress code applies, so dress modestly. Walk around Car Street to the Anantheshwara and Chandramouleshwara temples and the big wooden chariots. Breakfast: masala dosa at Mitra Samaj.
Lunch prasada at the Matha (served around midday), then rest through the heat.
Bus or auto to Kaup Beach (about 30 min) for the lighthouse and sunset on the rocks. Back in Udupi, finish with a Gadbad ice cream at Diana.
Head to Malpe Beach (about 20 min by auto or bus). Go early for the boats to St Mary's Island: about 30 min each way, roughly ₹300–400 return. Boats leave when full, from around 9:30 AM; ask how long you get on the island before you buy.
Fish thali lunch in Malpe, then a slow afternoon on the beach.
Sunset from the Malpe Sea Walk, then head back to Udupi or on to your train.
St Mary's boats stop for the monsoon (mid-May to mid-September). Temple and boat timings change, so check locally on the day.
No packing list attached yet.