Maze explanation is here.

Startbonus: 400 coins

Collections: 600 coins every 8 hours (7200), Total: 7600 coins.

The total does not include coins from Dragon TV or quests.

For collecting times check this.

Dragons:

Fresh -L- #1399: the path costs 4210 coins.

Orc -R- #398: the path costs 860 coins.

Key for Nature Knight on step 9 (460 coins).

Nature Knight -VR- #1200: the path costs 2825 coins + 1 key = 3285 coins.

Key for Robin Hood on step 16 (1915 coins).

Robin Hood -E- #215: the path costs 3630 coins + 2 keys = 6005 coins.

Key for Tierna Connaught on step 9 (2435 coins).

Tierna Connaught -L- #1382: the path costs 6020 coins + 3 keys = 10830 coins.

Time limited:

Aug 30 - Sep 1: Shamrock Rider -L- #1069: the path costs 8165 coins.

Sep 1 - Sep 2: Defender -L- #735: the path costs 8000 coins.