The following glitch can be done without having to use any programs to hack the game. To do it just visit your friends in Fish Isle and keep re-visiting the same friends (can be on the same day). Each time you re-visit your friends you get visitor points and eventually you will receive 1,500 coins, 80 EXP points and the top Jolly Traveller Medal.
The following is a simple cheat that will speed up your gameplay making it easier to gain money in shorter time. To do it you must have Cheat Engine 5.5 and Firefox. Warning: using this cheat might violate the terms of service of this game so use at your own caution.
1. Open Fish Isle in Firefox and also open Cheat Engine 5.5
2. Choose Firefox as your process in Cheat Engine 5.5
3. On the right hand side of the Cheat engine locate the Speed hack and check it.
4. Choose 5 (which is pretty optimal) or more, but don't go over 10 since that can get you disconnected ALL the time.