Cuba
Little yellow bubble taxis (there should be a photo of one in the gallery) are a great way to get around Havana. You get great views, plenty of fresh air (and petrol/diesel fumes if the wind is in the wrong direction), and they can get in and out of traffic and small spaces faster and better than the larger taxis. However, as they run on small motorbike engines, what seems to be low grade fuel, and have fibre-glass shells, they may not be for the faint-of heart worried about safety or those with too strong an environmental conscience.
Also, watch out for the prices - although they are meant to be metered, these often don't run and you may need to check/negotiate the price before setting off, to avoid a nasty surprise. But the drivers are usually willing to haggle.
All over Havana.
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