Dalt Villa means high town. Within its fine renaissance walls, built in the 12th century, are the ruins of 4 civilisations. Today, a Christian Catalan cathedral stands at the top of the hill which has many steps to reach. There are guided historical tours, and it may be advisable to avoid visiting the site during the hot heat of midday to 4pm. I would suggest either early in the morning 9-10 am and then go for lunch, or 5pm-9pm and then stroll down to the marina area for some tapas or dinner.