Assuming that Nevada law governs this purchase, you should follow what it says in that law. Your act to rescind the contract is what has to be within the time limit. The law you cite reads like it is calendar days, so if it were me I would follow that and send the rescission notice (signed by everyone that signed the contract) by certified mail, retaining the receipt, by midnight of the fifth calendar day. I wouldn't use personal delivery except as a back up to the certified mail because of the desirability of proof that you have rescinded by the deadline. The contract itself may provide additional means to notify Wyndham of the rescission.
For your question on points, Club Wyndham points cannot be used directly on regular Wyndham hotels through the Wyndham hotel website. Wyndham Destinations, the timeshare portion of the company, split from the Wyndham hotel portion of the company a number of years ago. The points that can be used for Wyndham hotels are Wyndham Rewards points, which are a different type of point than those used in Club Wyndham. It is possible to convert Club Wyndham points to Wyndham Rewards points, but there are limitations that have to be met, a fee applies, and the value of the points is typically greatly reduced (i.e., conventional wisdom is that you will lose 50-90% of what you paid in cash for the points by doing this). There may be circumstances where converting Club Wyndham points to Wyndham Rewards points makes sense for individuals in order to avoid losing the value to expiration or something like that, but those circumstances are best avoided by planning in advance.
Thanks. The contract says by midnight on the 5th calendar day after the agreement, either by mail with receipt or in person to developer. I was planning to walk in today and hand them something and get them to give me some type of receipt as well as send an email. And then mail something if needed as well.