I think the police station should go next to the town house because I think they go together. The campsite in the bottom lefthand corner overlooking the sea and the cafe in the top left hand corner!
I'd put the campsite on the right-hand side on the bottom of the map, where the river is sort of wider. That way, it's out of the way.
I'd place the police station by the town hall.
The cafe would look nice on one of the cliffs on the bottom of the map or near the town hall, depending on where you have more room and what your plans are.
i agree with the others, i think the campsite is perfect isolated, right in the bottom left. the cafe would look nice near the top left somewhere above the town hall, or the bottom right, and the police station could look nice next to the town hall! are you by any chance raindrop-crossing on tumblr? i love your blog so much
I actually think the campsite would look better in that tiny little area below the river on the far right between the waterfall and ocean cliff. It would still be isolated, but at least that would leave you with that other location open for better development.