Thanks to Simon and Stu for their advice. We have now been to Mexico, done our bit and come back, so I thought that you might like to know how we got on.
We had two days fishing,one deep sea and one on the lagoon.We didn't do as well as Stu on our deep sea trip but we did have a number of good amberjack and had baits chopped in half by barracudas that we failed to hook. To be honest we preferred the lagoon fishing from a boat.We only caught snappers and barracuda but both Maureen and I hooked and lost good tarpon. Heck those fish don't half go!! They spent more time in the air than they did in the water. Sadly they all managed to throw the hook but they have got us well and truly hooked and we will be back for another go as soon as we can afford it.