I have kind of a different take on it, I guess (talking about expensive, heavy lenses on travel trips).
I just got back from 9 days on the big island of Hawai'i (this isn't a once-in-a-lifetime trip for us though, Kailua-Kona is basically my home-away-from-home) and I didn't take a single 2.8 lens with me. I own 3, a 70-200 VR, a 105 VR and a Sigma 24-60 2.8.
I took 3 DSLR bodies, a D300, a D80 and a D40, I took an SB-600, my beloved Tamron 70-300, my 55-200 VR, my 18-55 kit lens and my wife's 18-200 VR and one of those c-clamp things with a ball head instead of a tripod.
We took zoo pictures at Hilo, and I used my featherweight 70-300 there and my D300 with the SB-600. My wife shot her 18-200 on her D80. Those were the only times the D80 and the D300 and the SB-600 even made it out of the bag or even the hotel room. The entire rest of the vacation I shot with the D40 in a small secondary bag, with the 18-55 kit lens and the 55-200 VR.
Why?
Because they are small, weigh nothing, cost very little and if they are stolen or dropped on the lava while hiking, or drenched by one of the fast downpours that hit you on the Hilo side, then it is not nearly as big of a deal as if you drop a D300 with a $1700 lens on it (or fall into the sea, or bang it against the rocks while climbing, or whatever)...
Another consideration for us is that we left our hotel at 6 am and often didn't return to it until 10 pm... and frankly the very thought of dragging around all that 2.8 glass all day makes my back ache (you CANNOT leave cameras in your car on the big island... they will not be there when you get back, it is a stone cold guarantee... when you go there, leave absolutely nothing in your car and leave it unlocked so they won't break out the windows checking it out... our car was gone through twice when we were there this time, and once every other car in the lot had a window broken out).
My pictures are clear, sharp, and look really good. The errors in them are not the fault of the cameras or the lenses, they are from the photographer. The D40 really takes great pictures, the image quality is fantastic... and the two cheap lenses are both very light and extremely sharp.
If I needed to take shots in darker areas, I simply got out my clamp, clamped it on a rail or something, and POOF, instant POD. I put the camera on 10 second delay, and there we go.
I even got some great low light shots of Nene (the endangered goose that is the state bird of Hawai'i in four different encounters with them...)
When shooting pictures of the Nene in low light, I really wished I had the 70-200 VR, but then again that would have meant dragging the 4 pound beasty around with me for 16 hours a day. NO THANKS! It is better to miss a shot or two.
(BTW I am totally ignoring our underwater photography gear that my wife was using while she was diving, plus the fact that we carried two full-sized bicycles and all of her diving gear with us as well... between that and all the cameras I did take, it was enough stuff for one trip... we even thew in a couple shirts, a couple pairs of shorts, and some undies as well).
To me when I travel on vacation, I enjoy photography, but I enjoy the rest of the trip more... the photographs (for me) are to capture the memories of the place... it would be different if the purpose of my trip was to take pictures (if I were going on a photo safari in Africa or a polar bear adventure) where the main goal was photography.
If i were you, I would take my camera and have fun with it, but really isn't the whole purpose of a honeymoon in Paris about something other than photography?
Just my take on it... my opinion is no more valid than anybody else.