Maze explanation is here.
Startbonus: 400 coins
Collections: 600 coins every 8 hours (19800) = 20200 coins.
The total does not include coins we can get from quests or dragon tv.
For Collecting times check this.
Dragons:
Crystal Carrier -L- #953: The path costs 28900 coins.
Eurus -R- #1001: The path costs 750 coins.
Biomass #1466 -VR- or Wave #427: The path costs 2585 coins + 1 key = 2965 coins.
Emberscale -VR- #1290: The path costs 2605 coins + 2 keys= 4955 coins.
Explosive -E- #334: The path costs 3800 coins + 3 keys = 7750 coins.
Berserk -E- #680: The path costs 4035 coins + 4 keys = 8565 coins.
Psychic -E- #872: The path costs 6525 coins + 5 keys = 13645 coins.
Nuclear #1465 -E- or Predator X #1415: The path costs 6700 + 6 keys = 15705 coins.
Demolition -L- #507: The path costs 10440 coins + 7 keys = 24970 coins.
Timelimited:
Jan 29-31: Voltage -E- #482: The path costs 2590 coins. Here we get puzzle moves.
Feb1-3: Eclipse -R- #225: The path costs 7850. We can get food here.
Feb3-5: Pyroclastic -E- #1376: The path costs 5300 coins. Here are flightstamps.
Feb6-8: Venus Goddess -L- #1305: The path costs 9500 coins.
Feb7-8: Solar -L- #1464: The path costs 9895 coins.