Maze explanation is here.
Startbonus: 500 coins
Collections: 600 coins every 8 hours Total: 5900 coins
For collecting times check this.
We can also get up to 600 coins from a quest and 250 coins from each set of videos in Dragon TV.
Dragons:
- Trickster Fae #899 - path costs 610 coins
Key for Swamp on step 9 (330 coins) - Swamp #873 - path costs 1425 coins + 1 key = 1755 coins
Key for Prowling on step 16 (975 coins) - Prowling #1159 - path costs 3350 coins + 2 keys = 4655 coins
Key for Natura Magus #1319 - path costs 3945 coins + 3 keys = 7515
Timelimited:
May 12: Dark Cave #608 - path costs 6405 coins
That path holds joker orbs and trading essences
May 13: Elusive #720 - path costs 5830 coins
That path has magic spells and legendary orbs.