The best view in Ayutthaya costs 5 THB, and it is the ferry crossing itself, not a temple ticket. If you are budgeting this trip carefully, start with what is free or nearly free before spending on entry tickets. Walk straight from the train station to the river pier and take the passenger ferry across the Pa Sak River, 5 THB, about two minutes, instead of paying a tuk-tuk to loop around by road.