Vacation spots in Florida?

I’m planning a beach vacation for July or August of this year, for my friends and I. We want to rent a beach house or condo. We’re considering going to Florida, but need some suggestions as to where. There will be about 15 of us, and most of us are ages 21-23, so we want to go somewhere that has a good nightlife. I know the obvious answers are going to be Miami/South Beach and Key West, and we’re considering it, but that’s just a farther drive. I’ve looked into Panama City Beach and Siesta Key Beach as well. But I know the busier seasons are the winter months and spring break, so if anyone can give some suggestions as to what a good spot would be for that time of year, that would be great! Thank you so much in advance! We also looked into Myrtle Beach. (Also, if anyone has suggestions for where to rent vacation homes/condos, that would be a big help! Thank you!)