Some of the things you mentioned have already been planned for further updates, eg (more bugs, completed story and dedicated servers, dynamic weather changes) the full list can be found here (https://grounded.obsidian.net/feature-board)
currently the devs are working on the SandBox, picnic table and BBQ area and beside the shed, being said the things you mentioned sound awesome and would be somewhat easy to implement such as a small river of some sort and abandoned houses, personally I think adding a drivable toy car would complete take the survival aspect out of the game, maybe even making it into a landmark that you can save and sleep in just like the lean-to perhaps?, but I do sir like you’re thinking