Hello,
my mother still has a silver lifetime membership at Emerald Cove (Colorado River Adventures) she would like to sell. My parents bought this a while back for over $9,000 when they had their RV. They used it for a while and loved it but have since bought a house on the AZ side of the river...
It is a Silver Lifetime Membership plan. I think all plans are different in what you can add or remove. I will PM you my phone number and if you are serious please give me a call. I can then get you additional information.