Scott, in order to enter the Mayan cave, you need to get ShaSha, the human pet, and get her up to 70 amity. Her death quest is at the Mayan Cave door, and after you have done the death quest for her, the door will be opened for you. Alternatively, I think you can join team with someone who has done the death quest, and let him/her bring you in... but you have to be lucky to find someone like that... XD

Also, I think using luxury fishing rod gives you fewer food (e.g. fish, sea food) and more materials. You can get snow grass too with fishing!!! It is very useful to make a cursed crossbow!!!

P.S. it is actually quite rare for Scott to post about the game, rather than about the forum...