I believe, to upgrade an adult 7 day base ticket to a 10 day non-expiring WPF&M ticket would cost you $259 U.S. plus tax
As per the chart below, you pay the difference between the 7 day ticket and the 10 day ticket - in this case only $9.
To add the the WPF&M feature it is $50, and to add the non-expiry option, it is $200. Here, you pay the upgrade fee on the full length of the ticket, even if you have already used some days.
So you will need to do some number crunching to see what is cheaper.
Keep in mind that a 10 day adult non-expiring, WPF&M ticket costs $490.95 U.S. (no tax and free shipping) from Undercover Tourist as a point of reference
HTH,
CPC
P.S. This chart is from 2008 so obviously there might be some minor changes and that any upgrades you make, must be done within 14 days of the first use or they will not be upgradeable at all.
Yes, do it after visiting a park. I did it before and both times it confused me and the GS CM as to why the value of my ticket when swiped for the exchange/upgrade was less then what my receipt stated it was worth.
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