In reply to Tom Valentine:
You've got to love an island hill. I can't think of a single one I've been on where the view hasn't been stunning, whether it was 10m or 900m.
Possibly my favourite isn't an offshore island, but the summit of Eilean Mor on Loch Sionasgaig. The views of the remarkable summits of Assynt, all around you, are awe inspiring.
https://www.flickr.com/photos/77080486@N05/16963322309/in/album-72157651958...
(CHeat, this isn't actually the highest point, but hopefully you get the idea!)
Beinn an Oir on Jura takes some beating for views.