Just come home having intended to do a couple of their trips but ran out of time, sadly. There are very full and comprehensive descriptions of a few of their trips on the website
www.lanzaroteinformation.com run by Jules and Miguel, ex-pats who've made their life and business out there. Jules tries these things then writes up, complete with photos. We thought they (Lanzarote Experience) seemed really good value for money and will definitely use them next time, especially the Fuerteventura day out.