Along the lines of what K6AER says, QRP from Hawaii with a wire antenna isn't always easy. I sometimes work QRP CW with a Hexbeam on the big island when the band is peaking. Your K1 covers 40, 30, 20 and 15 meters which is good because 15 meters will be your best band to just about anywhere. Looking at VOACAP HF Online shows 15 meters peaking to these locations at these times:
US west coast 1800-0300 UTC (8 am to 5 pm HST)
US east coast 0200-0400 UTC (4 pm to 6 pm HST), weak propagation
Japan 0200-0600 UTC (4 pm to 8 pm HST)
Australia 0400-1000 UTC (6 pm to midnight)
Western Europe 1700-1900 (7 am to 9 am), exceptional propagation helps!
For 15 meters a wire vertical length of 11 to 25' is good. If you'd like a 6 dB ocean boost in the direction of the ocean place the antenna close to the ocean. Having done this I'd say no more than 20' back from the edge of the ocean or a cliff overlooking the ocean. For more QSO fun you can operate during a contest such as the weekly CW ops at 1900Z, the upcoming JIDX, 7th call area QSO party, CQ WW WPX, All Asian and ARRL Field Day.
https://www.voacap.com/hf/