If you return to PV frequently, a time-share might make sense. Here are some tips for navigating the shark-infested waters:
Cruise the Internet before your vacation. Check out resale time-shares in the area, which makes it easier to determine the value of what's offered.
Worthwhile time-shares come with the option of trading for a room in another destination. Ask what other resorts are available.
Time-share salespeople get great commissions and are very good at their jobs. Be brave, be strong, and only sign on the dotted line if it's what you really want. Remember there are plenty of good vacation deals out there that require no long-term commitment.
Buyer's Remorse? If you buy a time-share and get buyers' remorse, be aware that most contracts have a five-day "cooling off period." Ask to see this in writing before you sign the contact; then you can get a full refund if you change your mind.