Here's my (much belated) solution to the quests issue from the April'15 OSW. Just go through the tiers from lowest to highest and complete all quests in a tier before beginning the next. If everything is sold, it might net a pony at least 4,000 bits.
Quest sequence:
- Tier 1: (pony training), Cutting it Close, High Time for Pie Time, Just a Stone's Throw Away, A Four Star Restaurant, Clearing Up Rainy Days, Good Old Days (pegasi only), Shown Their Work, Dandelion Tamer, Dust and Bunnies, Klondike Hikes, Mindless Violins, Supplying the Hospital.
- Tier 1.5: Good Egg. (An exception; this joins Tier 1 after High Time for Pie Time is completed.)
- Tier 2: Intensive Carrot Unit, Picking Up the Pieces, Chlorophiliac, We'll Fix It In Post.
- Tier 3: Removing Cookies and Browsing Data, Fission Mailed.
(Cutting it Close and Fission Mailed can both be skipped entirely as they produce no reward.)
I fully expect the above to become pointless or at least require reworking with the next open-server event. But this would make a good starting point.
EDIT: Updated for a name correction; this is now current to the Quest page.