March AND April can be very iffy, with chances of cold fronts coming thru and rendering walks on the beach uncomfortable and any swimming oudoors impossible....even walking on the beach then is done only by brave souls in warm-up suits and then some. Then again, it could be sunny and 70 degrees. Never know in March & April.
For Spring Break, to be "sure", I would concur with the previous posts, and recommend south Florida......anything north of Ft. Lauderdale may give you the same weather as HHI...... Ft Lauderdale and south toward the Palm Beach area is very popular. Miami is even warmer. Virgin Isles are even warmer. Aruba is even warmer.....you get the point.
We are going to Orlando this upcoming Spring Break, and have done that in the past, and it was fantastic....had temps in mid-70's all week.....that was a first-week-of April trip...another time we went during Pres's week, and it was also in the 70's ...but that may have been just lucky......anyway, Orlando is another possibility......slightly north of Ft. Lauderdale but within the nice temp range...(I almost forgot about Orlando)..
Good luck in the decision.....jme