The black rapid strap is a must and well worth the money if you're lugging an SLR of any size around for more than an hour or so IMO. Whats $60 compared to the DSLR investment overall?
Having said that I will echo what a few others have said. You should investigate maybe just taking 1 small camera. Last year I took my 5DII, a couple lenses, my flash, etc. to Turks and Caicos. I also took a (waterproof) gopro hero 3 black. Guess what we used 99% of the time? Yep, the gopro. I thought I was taking it for video and I ended up doing more stills with it than anything. It was cheap (relatively speaking anyway), water/dust/sand proof, and the super wide angle made for awesome shots. Heck, the "selfies" my wife and I took together looked like someone else took the photo!
The whole experience made me reevaluate my camera situation. Too often I ended up just bringing the iPhone (which is decent in its own regard but pales in comparison to a dedicated camera) because I didn't want to lug an SLR, worry about theft, etc. I am in the process of selling the gear in my sig; I bought a Fujifilm X100s and not only does the thing seriously rock, its tiny compared to an SLR. APS-C sensor, fantastic glass, and super compact. 95% of what a leica is, a fraction of the cost, and smaller to boot. But I digress.
Point is, make sure you are enjoying the vacation rather then fretting about gear. It sucks being the person documenting all the other people having fun!
Having said that I will echo what a few others have said. You should investigate maybe just taking 1 small camera. Last year I took my 5DII, a couple lenses, my flash, etc. to Turks and Caicos. I also took a (waterproof) gopro hero 3 black. Guess what we used 99% of the time? Yep, the gopro. I thought I was taking it for video and I ended up doing more stills with it than anything. It was cheap (relatively speaking anyway), water/dust/sand proof, and the super wide angle made for awesome shots. Heck, the "selfies" my wife and I took together looked like someone else took the photo!
The whole experience made me reevaluate my camera situation. Too often I ended up just bringing the iPhone (which is decent in its own regard but pales in comparison to a dedicated camera) because I didn't want to lug an SLR, worry about theft, etc. I am in the process of selling the gear in my sig; I bought a Fujifilm X100s and not only does the thing seriously rock, its tiny compared to an SLR. APS-C sensor, fantastic glass, and super compact. 95% of what a leica is, a fraction of the cost, and smaller to boot. But I digress.
Point is, make sure you are enjoying the vacation rather then fretting about gear. It sucks being the person documenting all the other people having fun!