If you like your trips with relaxing walks on the beach and fun-filled city activities, Swansea is a fantastic option for a long weekend in Wales. The coastal town is the second-largest city in Cymru and has loads to do for couples, families and solo trips for those who just need some time away this autumn. And getting there is a breeze as Swansea is served by First Great Western trains from London while visitors from Wales, the Midlands and south-west England can connect via Arriva Wales..