Stumbled across this by chance - crossing the bridge at the far end of the city we saw (or rather, heard) someone crossing the river. When we got to the other side, we saw it was only 10 euros per person and then a further 3 euros for a picture at the other side. Within 10 minutes we were strapped and ready to go. Professional and fun staff, we were even offered another go free of charge. Make sure you give this a go if you're in Toledo.