Between destinations for February honeymoon

Hi all! My husband and I are both very adventurous people and are almost ready to choose Hawaii for our 2 week honeymoon, but I want to do my due diligence and look into places like Greece, Costa Rica, maybe even Japan before just feeling like we picked the easier location. We are looking to definitely relax, but also have a bit of exploration for sure in there. I know these are quite different places – any thoughts are very appreciated! Would love to stay under about $6K.