Here are my wishlist of perfectly possible things we could have in the base game. I've put a 
emoji before the ones I believe are the most urgent.
Note that those are just things possible to be added as updates to the base game, so I didn't put any new rides or coaster models.
Terrain:
Themes:
emoji before the ones I believe are the most urgent.Note that those are just things possible to be added as updates to the base game, so I didn't put any new rides or coaster models.
Terrain:
- Snow texture;
- Square terrain brush (please!) like we used to have in all RCT games; I try really hard to make square and rectangle shape lakes and it's just impossible.
- Possibility to draw the area we want to raise / lower in the terrain just like we do with pathways and pools.
- Possibility to have bigger scales for the shape stamps (at least until 6, now we have until 3).
- Plant/bush style railing for pathways instead of just fences.
- Possibility to click and drag out fences and walls just like we do in the The Sims franchise; it would save so much time.
- Possibility to enable a grid view on the ground to make construction easier, specially to put the last pieces of the ride; it would be similar to what we have on pathways.
- Possibility to put entrances and exits on the sides of stations, not just on the front/back.
- We do need adjustable height on tower rides; I believe it's something people are demanding since the beginning.
- Decorative pools option to use them as fountain bases.
- Customizable maps; basically, a flat terrain in which we could shape as we want.
- Bigger construction areas for the parks.
- I believe everyone misses it from PC1 and it's something we would love to have as we now have the resort theming and the pools.
- ATMs.
- First Aid stalls.
Themes:
- Spooky Theme (from PC1).
- Victorian/Vintage Theme (from PC 1, but with more pieces).
- Arcade games, including classics such as pinball, air hockey and electronic games.
- Carnival games with prizes.