For the feel of a traditional pedal boat with a solar-powered boost, check out this concept. If includes "a center cockpit where up to four passengers can sit, alternating pedaling duties in 2 person shifts." Video after the break. Click here for first picture in gallery.
When you get tired (which should be after only a few minutes), switching to solar power can help lighten the load[via Gizmodo]
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[Source: Tech Blog]