Your OBOV is an Ocean View. They are very good at giving you the view you exchanged into as you receive what the owner who deposited owned. You may get a lower floor that does restrict your view, but you won't have a mountain view. Call MMO, ask for the front desk and request a view over looking the main pool and on a high floor. That is the best view you can get and you never can tell what the room assignment folks may give you.
I just returned from MMO and was charged $0.80 per day for Villa Tax and $12.00 per day for valet parking. EVERYONE pays for valet parking, owners included. Owners and exchangers receive free self park in the parking garage. I didn't ask for parking for renters, they may be $6.00 per day in the garage.
The Westin Hotel, 3 minute walk from MMO, has a free shuttle to WKORV, but I'm not sure if you can take it since you aren't staying there. It would be worth a phone call to the Westin as you are a "guest" at the conference.
Have a wonderful stay,
Aloha