Hi, to answer your questions
1) For the Temple inside the Bandit Camp, you have to quickly run to the other side and knock off about 1/4 of Jagon Life, this causes him to unlock the door and flee you can then chase after him and once you are through the arch way the poison stops.
2) The Secret mine entrance is part of the main quest later, once you are in dragon form you can come back to a totally changed Broken Valley and enter the mine which is only reachable with the power of flight (note enemies are around level 30 here and the boss can be tough.
3) Just so you know the pirate ship in a tree and also only be done with the dragon all other quests on the island and broken valley are lost when you complete the tower.
4) I haven't being able to to the soul forged chicken so can't help there
Bye
