i think there’s a temporary prohibition on place changes right now (due to the CIty Nature Challenge), but if no curators have stepped up to help you delete the point places, i think you should be able to get rid of the point places by merging them with the polygon places, keeping the names and boundaries of the polygon places. i checked a couple of the polygon places, and it looks like you’re the owner. so that makes it easier to get things done on your own, i think, although you could wait for curator assistance, if you’re nervous about making changes yourself.
here’s some discussion on the topic of merging point and polygon places, including some thoughts on where the point places may have come from: https://forum.inaturalist.org/t/editing-a-place-boundary/3547. this probably doesn’t affect point places, but this may also be worth knowing before you merge: https://forum.inaturalist.org/t/merging-places-breaks-collection-projects/8097.
someone else will have to speak to the appropriateness of Land Feature vs Open Space. i don’t think it really matters either way.