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:
FrozeBeast -L- #524: The path costs 28900 coins.
White Knight-R- #200: The path costs 750 coins.
Frostbite -VR- #448: The path costs 2585 coins + 1 key = 2965 coins.
Frost -VR- #352: The path costs 2605 coins + 2 keys= 4955 coins.
Zodiak Pisces-E- #297: The path costs 3800 coins + 3 keys = 7750 coins.
Zodiak Gemini -E- #288: The path costs 4035 coins + 4 keys = 8565 coins.
Frostscale -E- #1291: The path costs 6525 coins + 5 keys = 13645 coins.
Aquaking -E- #732: The path costs 6700 + 6 keys = 15705 coins.
White Princess-L- #1441: The path costs 10440 coins + 7 keys = 24970 coins.
Timelimited:
Dec10-12: Nitrogen -E- #768: The path costs 2590 coins. Here we get puzzle moves.
Dec13-15: Mwahaha-R- #607: The path costs 7850. We can get food here.
Dec15-17: Lunar Eclipse -E- #1087: The path costs 5300 coins. Here are flightstamps.
Dec18-20: Elder Glacier -L- #1510: The path costs 9500 coins.
Dec19-20: Blizzard Breaker -L- #1606: The path costs 9895 coins.