To answer and clarify your questions, here is the best attempt that I can give you:
First of all, the Daily Double VISA promotion ended on June 30, 2000. If there is another "double points VISA" promotion that you have discovered, please fill us all in.
Secondly, Ritz Carlton will not accept Marriott Cheques. I tried to use mine in Arizona and they did not honor them. On the reverse side of the Marriott Cheques, it is stated the nine "Marriott Properties" that are participating in the Marriott Cheques program.
Finally, you will receive full Marriott Rewards points for using your Marriott Cheques. They are treated just like cash at any of the participating properties...just don't try to get change back for any outstanding balances because it states right on the back of the certificate that change or cash cannot be returned for any unused portion of the certificate.
I hope that I have been of assistance to you. I purchase Marriott Cheques frequently from VolumeBuy.com and GiftCertificates.com through GreenPoints.com. This is a fantastic way to accumulate additional "loyalty points" through many different sources. Also, do not forget to use your affinity credit card to earn more points...you certainly cannot get enough of those!
Bob Linderman
Akron, OH