Hawaii is quietest in the spring, right between the winter rain and the summer crowds. The water is warm, the beaches aren't packed, and you can actually find a spot in the sand to yourself.
A trip like this usually runs about $2800. Since that is a lot to drop at once, you can use the Discover it® Cash Back to spread the cost over time. It offers 0% intro APR for 15 months on purchases and balance transfers, which means you pay no interest for that period.
The 0% intro APR is a deadline, not a gift. If you still have a balance after 15 months, the card will start charging interest on whatever is left, which gets expensive fast.