I was just looking at different safes.
Here is a regular hotel safe which would be large enough to hold a briefcase, laptop ect. But, IMO, the thieves might be able to carry the whole safe away, including it's content:
And here is a "Mesa Safe Burglary & Fire Safe Cabinet", it's heavy (860 lbs). But it's also expensive to purchase and who know what the transport costs would be to have it shipped to Aruba. In addition, it's a "monster", takes a lot of space:
Here is an interesting link about Laptop theft: