it's not 'abroad' but if you want a hotel for children I can reccommend 'Old Park Hotel' on the Isle of wight. They've got a web site. It's got loads of character,loads of space, & only caters for families. It's on the southern most tip of the isle of wight, with a path to an almost private beach.
having said that it's hard to get away from the sea on such a small island.
I love the IOW & found that the roads are never jammed even in high season, especially if you keep away from Cowes week etc.