we just returned from Westin St John last saturday. We rented so we could take our kids and go the same time with friends. I called all year to change to the week we needed but no luck. My week is 35 and I've called to see if we can change dates to later in the year...they said nothing was available at all for WSJ. Should I bank the points or put it in interval? they told me that if I do the points thing I have to use them this year. they didn't mention a waitlist to me. Maybe I should call back..? although we cant afford to go back this year.
I would think that you could have rented out week 35 - but isn't that only 2-3 weeks away?

I'm sure if you had started advertising when you decided you couldn't use it, you could have rented it and made a nice profit, but it's kind of late now. You could always throw it up on the TUG Last Minute Rental board for a few days and see if you have any takers, but the Max you can ask is $700, which won't even cover your MF, I'm sure.
It's too late to convert to Starpoints - that had to be done by Mar. 31st.
It's too late to deposit it with II as well - somebody like San Francisco Exchange Co. might accept a late deposit of this quality.
Starwood might accept it in the rental pool, but there are no guarantees there.
If you convert it to Staroptions, you would have to make an exchange somewhere in the Starwood system by the end of the year. If you can't go on another vacation you could use the Staroptions to exchange for a popular week and then rent it out.
Good luck! Let us know how it goes!