Apologies for not reply sooner - I have been away and am only just catching up with MORPS postings.
Yes, you should be able to give 12 months notice to RCI to surrender your Richmond Park RCI Points and terminate your membership of RCI Points.
With regard to the Crown Resort points, you would need to check your terms and conditions. Did you transfer over to the Crown Resorts Club in the past couple of years when RCI Points Ltd was offering transfers out of RCI points Ltd? I would hope that the terms and conditions set up by Crown Resorts would be similar to those of RCI Points Ltd.
MORPS Membership Secretary
Elected Board Member for RCI Points Ltd
Owner Las Farolas on Costa del Sol, and Sudwala Lodge S Africa