That looks like an inflatable? I found a coupe of Ocean kayaks at Dicks Sporting goods website, that look pretty good . Not tandems but look like they would be a stable platform . kirby
http://www.dickssportinggoods.com/product/index.jsp?productId=2674493&cp=2367438.2367826.2672651.2674153 http://www.dickssportinggoods.com/product/index.jsp?productId=2674496