100 Bonefish flies? I hope you tied some blind or with mono eyes. I hear they're really spooky in thin water in Belize. I'm bringing about 20 Charlies and Gotchas(wht, tan, olive, brn, orange) - half blind, half mono. I've also got some shrimp and Bonefish Bitters as well as small Clousers all in sizes 6 and 8 only, with most of them being 6. For Tarpon I'm bringing Black Death, Cockroach, Burnt Orange Grizzly, Stu Apte Red and Yellow, and Lefty's Red and White. I've got 'em in 1/0, 2/0, and 3/0. These sizes allow me to get into the resident babies and if all goes well the migratory Tarpon will start to move in and I can make use of the 3/0. I didn't even consider 4/0, but I would if I were going in the late summer. If I absolutely had to pick only a few, then I'd take the Cockroach and Orange Grizzly in 2/0. That covers dark and light and 2/0 is apparently the best choice if you're limited in tackle.
Don't forget the tandem cuda flies(2/0 green/wht, blue/wht). I'm going up to the cut to use these from the bank.
What dates are you going to be there in April? I'm heading down 4/10 - 4/18.
~ May you lines be tight ~