With the release of SH I came up with an idea for an expansion... 

Intorducing: Sprinfield National Forrest (SNF) 

Why would this be a good expansion? 
-This expansion would come with more decorations like: 
Stones, fallen trees more shrubs etc... 
-Alot of things from classic simpsons episodes can be found in a forrest area. 
-Introduction of more wild animal types, like: bears 
-Introduction of more ground covers, like: dirt 

Where can the national forest be found? 
It can be found all the way to the back of springfield in the mountain area. So thats next to springfield heights. Counting from the back you will get 7 strips of land thats: 7*6 = 42 pieces of land. 

There would be 2 strips of land unused between SH and SNF these could also be released or maybe at a later date. 

How much does land cost? 
The land unlocked here would cost cash. It will unlock around level 35/40 so the land will cost from 50,000 to the 150,000. 
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Story: 
Lisa discovers a path in the mountains, but sadly rocks block the path. Lisa asks around the town and springfielders start digging and removing the rocks finding the springfield national forest. 

Homer and the family discover a race track where they find Maude Flanders who is alive because this is tapped out. 
Lisa doesn't agree with a race track in the forest and protests against it but loses. 

The also are other questlines. 
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In the shop: 

-Characters: 
*Ranger in Mt useful Visitors Centre -$20,000 
*Maude Flanders in Springfield Speedway -$50,000 (Unlocks once speedway is upgraded to the max) 
*Grant Connor in Grant Connor's Cabin - $150,000 
*Ranger McFadden in Ranger lookout post -100 Donuts 
*Bear NPC -25 Donuts 
*Wild reindeer NPC -FREE 
*Bigfoot Homer in Mudpool -15 Donuts 

-Buildings: 
*Mt useful Visitors Centre -$20,000 (unlocks ranger) 
*Ranger Lookout post -100 Donuts (unlocks ranger McFadden 
*Grant Connor's Cabin -$150,000 (unlocks Grant Connor) 
*Springfield Speedway Entrance -$50,000 
*The Rolling Stones Rock N' Roll Fantasy Camp -60 Donut 
*Storytime Village - $75,000 

-Decorations: 
*Mount Useful -$100,000 
*Springfield National Forrest Welcome Sign -$500 
*Springfields oldest redwood tree -$10,000 
*Lisa Tree - 30 Donuts 
*Hosey the Bear -40 Donuts 
*Springfield Dam -$1,500,000 
*Mudpool -15 Donuts (Unlocks Bigfoot Homer) 

Non unique: 
*Tree -Various version and prices 
*Berry Shrub -$250 
*Rocks -Various versions and prices 
*Fallen trees -Various versions and prices 
*Other forest deocrations 

*Dirt road -FREE 

-Returning: 
These all return for a limited time 
*Springfield Falls -50 Donuts 
*Snake Rocks -40 Donuts 
*Snake Stump -55 Donuts 
*Hollow Snake Trunk -75 Donuts 
*Fever Cabin -60 Donuts 
*Homer Fever Snowman -20 Donuts 
*Burns Fever Snowman -20 Donuts 
*Murderhorn -250 Donuts 
*Duff Racer -45 Donuts 
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Springfield Speedway 
Once you rebuild the first section of the speedway which is the entrance you will be able to rebuild the whole speedway by upgrading. You can send springfielders on tasks at the speedway this gives you Racecar tires. 

There also are tasks that take place in the forest which give you leafs. Upgrading the speedway to the max completes it and unlocks Maude. Once upgraded to the max all jobs that payout tires or leafs disapear and the speedway pays out cash. 

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Character Collections 

*Flander Family shows Maude Flanders instead of ghost Maude. 
Once Maude is unlocked and you have ghost maude, ghost maude will change into a character skin. 

*Forest people: 
-Ranger 
-Ranger McFadden 
-Grant Connor 

*Wild Animals: 
-Bear 
-Wild reindeer