There are parrots, monkeys & lifeguard available for gems, silver & bronze sand dollars. There are no characters available to rent for coins or gold sand dollars.
Make a short term character available for half or even a whole million coins. Make a short term character available for gold sand dollars.
Apply this to event guests (like Piper) also.
During the holiday event recently Multiplying Boosts that cost coins were available for event items turned in. I used this often and still had more coins at the end of the event. I liked this feature and would like to see it more.
If you can't be a good example, you'll just have to be a horrible warning