I think it would really add some replayability to challenge mode if we were able to unlock sandbox options upon getting a park up to 5 stars on any given island in challenge mode.
Challenge mode offers a different gameplay experience, which is very reminiscent of JPOG - in that you unlock more things the higher rating your park is. The problem with it is the only current rewards are skins for various dinosaurs, and once you've achieved a Jurassic difficulty 5 star park there is no more reason to play on that park. All gamplay (for me personally) comes to a screeching halt on challenge mode parks once I get the skins because there is nothing else to earn and all of the crazy disasters, contracts, and money struggles restrict any creative things I might want to experiment with. Unlocking sandbox options would allow for players to make the changes that they want, allow for creativity, and would be a worthwhile reward, especially for those who slog through Jurassic Difficulty and those that want a sandbox experience on something other than Isla Nublar.
Challenge mode offers a different gameplay experience, which is very reminiscent of JPOG - in that you unlock more things the higher rating your park is. The problem with it is the only current rewards are skins for various dinosaurs, and once you've achieved a Jurassic difficulty 5 star park there is no more reason to play on that park. All gamplay (for me personally) comes to a screeching halt on challenge mode parks once I get the skins because there is nothing else to earn and all of the crazy disasters, contracts, and money struggles restrict any creative things I might want to experiment with. Unlocking sandbox options would allow for players to make the changes that they want, allow for creativity, and would be a worthwhile reward, especially for those who slog through Jurassic Difficulty and those that want a sandbox experience on something other than Isla Nublar.