any suggestions for a good beach vacation spot?

My fiance and i want to go on vacation for about a week this december… we were looking into hawaii but it seems like it would be expensive to stay there (not the travel package, just the food and activities). if anyone has any experience in hawaii or a better suggestion, any input would be great. we just want to relax and be lazy somewhere with a great beach, preferably somewhere with a bar that is not too expensive to eat/do stuff. thanks : )
ps we are 21 and 23 years old

Check out some of the top ten most popular beaches. Im sure you can find one that fits your budget and needs. Enjoy!