You may want to start a new thread for this topic. Otherwise, you'll probably just get responses from boarders that scroll down the page after scoping out the photos up top....
You've asked a bunch of questions, that a lot of people will be glad to help you figure out. However, without you providing some basic information, that's gonna be kind of difficult. For example, you need to consider if you'd rather be in a hotel or condo. How much do you have to spend for lodging? What are your interests - diving, snorkeling, kayaking, Mayan ruins, etc. How long will be in Belize? Time split between Island and mainland or 100% on AC?
You can save people that are going to help you a lot of typing by doing a search on the board. You can find maps with links to hotel/resort websites and restaurants. There are links to tour guides, etc. You can also do a search for specific subjects and find what board members have already written.
Finally, as much as I love Belize, I know that it's not for everyone (particularly in hurricane season - October!) Before you set your mind on San Pedro, do an in depth exploration of this website. You'll have to decide if it's where you want to honeymoon. I fell in love with San Pedro before I ever set foot there - the same could happen to you.