$99 is a great rate from WestJet. Lucky you!
We like to stay at any of the hotels along the S. Harbor Blvd strip. We really liked the Hilton Garden Inn. It's in a Hilton triplex along with the Embassy Suites South and Hampton Inn and Suites, and depending on your budget, any of those 3 hotels are good choices. It's a short 5-min drive away, and if you don't want to drive, the ART stops in front of the Embassy Suites. We got a really good rate one time at the HGI - $90 for bed and breakfast. It's good to get a hotel with a full hot breakfast included - gets you out the door and to the parks faster.
Buy at least one hopper pass from CAA. It gives you free daily parking in the DL lot (a savings of $14/day). (We got our other hoppers from Airmiles.)
Target is a short drive away on S. Harbor and Chapman, where you can get your bottled water and snacks. Next door to Target is a Dollar Store, where you can buy Disney-themed notebooks, pens, pencils and other souvenirs for cheap.