1-congrats.
2-never been to Aruba but did just get back from USVI in April. Generally same area and fished the Caribbean Sea.
Flies-bring different sizes of the same thing. I got caught throwing Crazy Charlies that were too big for the bonefish that were hanging out right in the surf in front of the hotel. I wish I had smaller stuff. Keep your eyes peeled when you take the honeymoon stroll along the beach. You can see all sorts of critters in the water. Wading boots/old sneakers are always a good idea.
3- For travel spinning rod, I have an albright dot com rod. Google albright fly rods and hit their clearance section. The explorer travel spin rod is very fairly priced and I love mine. I have a 7'6" that I paired with a Shimano 4000 series. The travel case is not so big but roomy enough to put several different rods in them. You could probably fit your fly rod in there and you can carry it on the airplane.
4-If you are strictly fly fishing then disregard balance of this line, but I would bring artificial blood worms or clams, commonly known as fishbites. Bring small hooks to catch bait fish-really small like 10 or 12s. Catch the bait fish and either use a fish finder rig with a 1oz weight or free spool, and the live line the bait fish by hooking thru dorsal fin. You will be surprised what takes its. I had a grunt come back looking like it got hit by a machete. I also had a fight between two huge snooks one night. Unfortunately they broke me off quite quickly. If you can, bring some reasonable slzed leader material, like 30or 40lb fluorocarbon.
5-Knife-if you carry on only then I suggest hitting walmart for a pair of kitchen shears. They cost a $1 or so and as long as the blade is less than 4 inches, you should be able to carry it on. Kitchen shears are great bc the blade is big enough to filet the aforementioned bait fish or you can just plain cut bait with them.
6-I looked on Google Earth at the location...To the
north there appears to be an area where there will be water movement. I found that area to be very productive in USVI. To the
south,
there is a dock. If you are not too busy, especially at night, hitting the dock will be very productive. I found all kinds of fish hanging around the pilings.
7-FWIW, your future wife sounds cool to go fishing with you, my wife and family generally put up w. my OCD fishing disorder on our vacations.
Hope this helps. I have more suggestions if you want to reach out privately.
John