J.P.
I used to live in Hawaii----First of all, Hawaii isn't a large island but talking about "attractions"--_What type of stuff are you lookign to do??? July is Peak season (I worked for the Hyatt for 7 years) and prices will vary due to location. Thinking of hotels with kitchens here are some good lovations:
Waikiki Sunset 1 (888) 782-9722
Waikiki Banyan ###-###-####
They have Kitchens and MOST hotels have laundry rooms in the building (not in the suites though). You might want to call them. ANy other questions, feel free to message me... Have a great trip!