Holiday trip to Sri Lanka, gear and sightseeing suggestions please!

[qwRad]

Hello everyone!

I'm going on a two week holiday trip to Sri Lanka (Jan 21st - Feb 5th) with my girlfriend and would love to hear some suggestions on what gear I absolutely need and what places to see. We are going to stay in Koggala Beach Hotel (Google maps) and will probably do at least a couple of 1 or 2-day trips. The Yala National Park is on my list at least.

I'm going to take basically all my gear:

• EOS 7D + spare batteries
• EF-S 15-85mm IS USM
• EF 85mm f/1.8
• EF 70-200mm f/2.8L IS II USM
• Sigma 30mm f/1.4 EX DC HSM
• Samyang 8mm f/3.5 Fisheye
• Benro A-169M8 Travel Angel tripod + BH-0 ballhead
• Nissin 622Di II flash
• BlackRapid RS-5 strap
• Burton Zoom backpack to hold the gear
• Tamrac Rally 5 shoulder bag for shorter walks
• 2 x 32GB CF cards + MacBook Air + 2.5" USB-powered portable HDD

Anything essential missing? I will need to purchase a ND filter at least to get some cool long shutter wave shots. What would be a good strenght? Are the variND filters any good? I'm also trying to decide if I should get a 72mm filter or a 77mm one with step up ring so I could use it on both the 70-200 and 15-85. Do you generally use filters that much with longer lenses? What brand to get? B+W is a little pricey IMO so budget friendly but still good quality options are preferred. I'm thinking about a CPL for the 15-85 too but somehow I didn't seem to use it much when I had one with the 70-200mm f/4L IS USM. Perhaps I was doing something wrong, any tips on using a CPL?

Perhaps this is all for now, thanks in advance!