I've been able to get my holiday buildings up to level 2 just with free items that each requires, but then I have also taken each to level 3 with gems because their profit is so great at level 3. If you assume that you hold an event in each building, here are some comparisons:
These figures are for the profit of the building plus its event PER MINUTE:
- Red Dragon Hotel (St. Patrick's Day) - $122
- Happy Santa Hotel (Xmas) - $120
- Snow Castle (New Years) - $116
- Fairytale Castle (Valentines) - $114
- Easter Miracle Hotel - $114
- Wild West Hotel (non-holiday,950 gems) - $103
- Bathyscape (non-holiday, 750 gems) - $89
- Villa (non-holiday, 650 gems) - $80
- Four Aces Casino (non-holiday, 1.3m) - $72
- Island Hotel (non-holiday, 40 gems) - $72
- Bavarian Inn - $48
- Deluxe Hotel - $47
The list isn't complete, but is enough to give you an idea for how much more profitable the holiday prizes are compared to regular buildings. WELL WORTH THE EXTRA EFFORT!
Comment found on Paradise Island 2: Resort Sim: Is it possible to get...
No don't waste gems refreshing the wondershop. Just be patient. They eventually show up, but slowly.
Comment found on Paradise Island 2: Resort Sim: Building the pyramid ... stuck...
Iron keys come from the Treasure Hunter's House with the blue roof. Sometimes you also win speed-up helmets or gems. Click the building then click the middle button below it that says boxes. You can do this every 3 hours and the button will show you when the next set of boxes will be ready to open.
If you don't mind spending a little money, it's great to buy the additional box they try to sell you. If you do you always get to open TWO boxes every 3 hours. Otherwise you get one box each time.
Comment found on Paradise Island 2: Resort Sim: how to collect iron keys...