Hoisted by my own petard (to be foiled by your own plan), is a nice flowery one, although it actually makes sense. The bee's knees (for something excellent) is a good one that makes no sense. Wet behind the ears (inexperienced) is another cool one.
Everyone here will tell you their own country is gorgeous. If I was you, I'd go to the UK and Ireland, visit the giants causeway, the lake district, Snowdonia, the Yorkshire dales.