I have a cheat to speed up everything and get you loads of xp but have to follow it EXCACTLY
1. Get all of your sims to plant beans
2. Double tap the home button and get rid of everything on there.
3. Go onto the sims and wait for about 2 seconds and then come off of it
4.Go to settings and turn airplane mode on
5. Go to general-date and time and then turn off set automatically
6. Change the date to a month ahead
7. Then really quickly, turn off airplane mode, double tap the home button and go onto sims
All of your beans will have grown and all tasks will have sped up.
You can do this cheat to speed up ANYTHING! Work,baking,planting, and all item uses.
As well, if you have the mysterious island, you can get the materials to upgrade your monuments.
At the moment I have 4 swimming pools, 2 mansions and have bought loads of buildings.
Hope this works for you!