Easy tips to lose weight?

I am trying to lose 10 pounds + over the summer, i am currently 5''4 1/2- 5''5, weighting 130, i want to get it to 120 or less. I have a lot of belly fat, if I hula hoop 30 mins a day till the end of July, will I get a toned flat belly? I also wanted some tips on losing weight, like those little tips that are sneaky and all that :) Lastly, what are some reps I can do to trim down my thighs, butt and legs?