As far as I can tell, the only games of that type on the DS are SimCity DS, SimCity Creator, and City Life DS. But I do realize these aren't exactly the types of games you're looking for. You want a resort sim. And I don't think any exist on the DS. Even "Tycoon" type games are closer to what you want. For those, there's Zoo Tycoon DS and Theme Park. There may be others I don't know of. As far as homebrew, I have no clue.