For a weather-proof option, try the Bryan Museum, which would be suitable for a shorter time frame and smaller groups.
Galveston Scavenger Hunt Boundaries
Galveston Scavenger Hunt Sample Tasks
How many banks were on the Strand in its heyday?
How many large stars are in front of the Opera House box office?
Take a photo of a flood marker.
Take a photo of your team with the “Greetings from Galveston” mural.
Galveston Scavenger Hunt Photo Gallery
Check out this group having a great time on their Galveston corporate team building program.