I used to be great with a map, moved to New Zealand for a couple of years about 10 years ago now and got everywhere with an old fashioned A-Z. Attempted the same a couple of years ago on an unfamiliar route in the UK, turned into quite the adventure!
So I really wanted something but didn't want to pay the really quite ridiculous amount the rental company asks. So compromise found, I happen to think £15 for a fortnight is a bargain, especially there being a good chance I won't need it again for some time.
I have however, just ordered some clothes to be delivered to my hotel. I do a lot of shopping from the US (best place for vintage and vintage reproduction clothing) and one has a brilliant sale on at the moment. Cheaper shipping and no customs fees and extra holiday clothes. That's my shopping treat as I'm not likely to hit the malls while there, nothing in them for me.
Getting excited now, just over a week to go!