You don't need to deposit the entire 2 br Ko Olina to get 2 br at Marriott Maui MM1. You will have preference for Marriott Maui. You can add Westin Nanea WNA as well.
Lock off your MKO and deposit the two units separately.
Typically the week leading into Easter, March 27, 28, 29
or the week of Easter April 4, 5, 6 would have the highest Travel Demand Index TDI for April. Other than Easter, April is medium demand for Hawaii.
The 2nd week of April in 2026 is April 10, 11, 12. Easter is April 5, 2026.
I would
not reserve the second week of April, week 15.
I expect the TDI of week 15 to be only 130.
In general, you want TDI 135 - 150 to get the top resorts. However, since you want to trade into Maui for second week of April, (also medium demand time), it should only matter if you split your unit into the 1 br and Studio.
II hasn't published 2026 TDI yet, but typically it's the week of Easter that changes by a step of two.
If you're willing to wait, the highest TDI will be the July weeks. At least wait til mid-June, week 24
Here is the current chart. Go all the way to the bottom to read the TDI. Starts with 50, ends with 150, each square steps up by 5.