I used to work in Galveston and live not too far away. Galveston is what you make of it. There are bad parts and good parts to it, like any city. My recommendation is to find local restaurants and shops that are recommended on yelp or other apps and give them your business because there is some great food and interesting shopping tucked away throughout Galveston. As far as historical and architectural - hit the library!! If you start there you can NOT go wrong.

I want to explore Cozumel more. It's just so pretty.

Driving through Belize and taking pictures and seeing some of their historical parts was interesting. We enjoyed getting to know our taxi driver who was a quiet man with a honorable history. He dropped us off outside the port so we could shop at the street vendors. I didn't like how one little boy (5-7yo) asked me for money for food and when I offered him a snack I had packed he ran off. Then, when walking around street vendors they wouldn't take my polite no for an answer. After that experience we decided to just go back to the port and not be in the "real" Belize. I feel like I missed out on the shopping that many people say you should do while in Belize.