In reply to stuartR:
> taking my girlfriend and need to keep her happy
You can't keep her happy. Only she can do that.
How about that exciting walk southwards from Bethgelert, along the river? There is even a bit of via ferrata on it, just above the raging torrent (hopefully not just below the raging torrent).
another walk that I love is over on Anglesey, parking at Newborough, then going over the meadows, through the woods, across the beach and onto the wild and windy peninsula, from where you can watch the clouds gathering on the hills... Hide a flask of hot chocolate with Cointreau in it and whip it out at an opportune moment...