Nikon D5300, 18-140mm VR lens, 70-300mm AF-S VR-G lens, circular polarizing filter for the 18-140mm lens, small tripod, plenty of memory cards, and a medium-sized fanny pack that will carry the 70-300 VR in a water bottle pocket; not too surprisingly, there are many fanny packs that have water bottle pockets that WILL hold the 70-300 lens perfectly, snugly, and safe from drops and accidental fall-outs. I have two such fanny packs, and both make carrying the above type of kit super-easy.
My feeling is that when traveling, you want to keep the kit simple, and light, and compact, and that is what the D5300 + 18-140mm VR + 70-300mm VR kit is designed to do. If you want a lot more reach in telephoto, you'll need to spend another $1,000 or more. The NEW 80-400mm AF-S VR Nikkor is rebated now, with a $400 rebate thru the end of February,and is a realllllly good lens. But bigger and heavier than the 70-300 VR is.