We very much all enjoyed the Speedboat Sightseeing tour, the boat was great and was more exciting than a typical sightseeing tour and it was a reasonable price (something which seems to be the exception now as a visitor from the UK with the poor exchange rate).
The only thing which let the tour down was the commentary, which was rather childish from the would-be 'comedian', who appeared to just talk drivel for the sake of talking.