[Radek]

1. Ladders. Ignore them and jump down. Annoying? Yes, but much less annoying than trying to climb down.
Without the Athletics skill, you will get 3 - 5 HP of falling damage. With some Athletics, say, Athletics 5, you will usually get 1 - 2 HP of falling damage. There is also the Deadfall trait in the game, which is supposed to reduce the falling damage even more but it does not. It will work only when you jump from bigger heights.

2. Ekbu. He will consider you an Ukabu only after your meeting Mekdawa and talking with him. Without Mekdawa, you are no Ukabu. Typing "Ukabu" or selecting it from the list after Reset Adventures does not help. You must speak with Mekdawa.

3. The Warrior's Guild quest. Jumping down into the Toad Village is enough. You can climb out and go to the questgiver immediately. Shinwiki and his quest is completely independent on it. You can return later and meet Shinwiki if you want. You can bypass it without any consequences later in the game.