By now a lot of the basics of the game will be unlocked, but if you take a moment to view the whole playing area there are significant sections that can still be unlocked.
At this point you probably have the following make it buildings:
Ice Mountain
Red Hot Chili Plant
Spider Web Farm
And also the following distractivities:
Paradise PiƱata
Hammock
Volleyball Net
Island Soccer
Horseshoes
At some point while playing these levels you'll probably have completed the Fishing Frenzy goals a couple of times and cleared a couple of new areas for more space.
It's going to just be a matter of grinding through and utilising your Minions in the best way possible.
The way we did was to make sure we had at least half of our minions engaged in distractivities working towards more party points - and therefore more level gains. Whoever we had left over after the distractivites were all filled up we tasked on general 'making it' tasks - a bit of everything, cocnuts, clams, ice etc... taking care not to fill up the storage center.
At this point it's probably a good idea to talk about the storage center, which has a marketplace option after level 5. Basically you can sell back to the game whatever items you have too much of, and the good thing is while they are on sale, they do not count towards your storage limit... But once you have put them on sale they cannot come back to you, they can only be deleted (if you can't want for the sale to go through). The sale usually takes 24 hours - I think it is more or less if you adjust the price. Discounting items will get them sold more quickly.