Edinburgh is best seen in late autumn when the leaves turn or mid-spring before the summer crowds arrive. You can wander the castle grounds in the mist or head into the underground vaults on a ghost tour while the city feels quiet and historic.
A trip like this usually runs around $2800. If you want to spread that cost out, you can use the Citi Simplicity® Credit Card, which offers 0% for 18 months on purchases and balance transfers from date of account opening.
That 18-month window is a deadline, not a gift. If you still have a balance on the card once that time expires, you will start paying interest on the remaining amount.