I quite like blind shots being thrown into the mix. How many is too many? All I can think is I will know it when I see it and I havent seen it yet. I certainly like blind approach shots as the thrill of wondering about hitting the green or even being close is greater than the thrill of have I hit the fairway, but both are fine to be honest.
A few favourites off the top of may head:
Painswick, 5th, tee shot to a 110 odd yard hole, which is blind because you play up, over and into an old iron age fort.
Royal Dornoch, 17th, approach to the green (assuming from the lower fairway of course!) as David T has already mentioned.
Liphook, 9th, approach shot over blind heather covered mounds, as Sean A has already mentioned.
Burnham & Berrow, 3rd, approach shot to a punchbowl green. Wind behind it can be a flick with a wedge, into the wind it cam be a long iron which is certainly a thrill to see on the green!
Royal Cinque Ports, 3rd, long approach to the green with all sorts of humps and hollows before the green and then some cool banks and tiers at the green itself. And no easier if you choose to lay up!
Royal County Down, 9th, because of the view as you reach the top of the dunes.
County Louth, 3rd, long approach to the reachable par 5. Need to get the approach just right or it runs off left leaving a very tricky chip.
And a slightly different type of blind hole...
Burnham & Berrow, 1st, approach, but only if the drive is to the right of the fairway. A slightly different thrill when you think you've hit a good one, running over to the left side of the fairway were there is a clear view of the green. Or the approach to the 6th at St Enodoc which is similar but more difficult!
Probably forgetting some obvious favourites, but you get the idea I like them.
Cheers,
James