At a guess...
Set the black and white points in lightroom, then push the contrast a little more.
In the HSL panel in lightroom, adjust saturation of (for some of the pictures), green, yellow and red.
Also adjust luminance on the colours, dropping it down a bit then adding saturation back in can help get that rich look on certain colours.
NIK color effects does have that tonal contrast thing which is good for local contrast, just mask it and apply selectively.
Skin smoothing could be the portraiture plugin, a lot of pros use it as it's fast and looks pretty good, these do have that portraiture "smoothing" look I think.
There are loads of presets out there that do the basics, these have the look of the "Jake Olson" preset collection look to me, you could give those a try
There's probably a hundred ways to get a similar thing, you could do a bit of glare/glow overlay set to soft light and masked in to get that summer glow feel. In fact a good tip in general for adding quick, punchy contrast is, duplicate layer, set blend mode to soft light, opacity about 10 or 20% and it gives a pretty nice "pop" to an image.