I would like to book a Paris Seine River Cruise and lunch at the Towel Eiffel. There are many companies offering this package. What companys are reputable and offer a good experience.
It's SO EASY to arrange these things yourself. Just get on the ET website, pick out which restaurant you'd like, and make your reservation. You can do the same with a river cruise, in fact, you can just walk up and buy a one or two day ticket from just beneath the ET. It stops at most of the sights along the river and is a bargain. The night cruise that leaves from near the islands is easy to buy tickets too prior to arrival. I can't help you on a dinner cruise but many avoid them for a variety of reasons, mainly price and average food.
George is talking about the Batobus. It has tickets places on both channels of the Seine about even with Notre Dame as well as all its other stops. It's a hop on/off affair. Check the shut-down times against the onset of darkness - - it's done by dark in the summer.
I don't know what a meal at the Eiffel Tower coupled with a Seine River boat ride costs, but you can easily do it yourself. In fact, I've never heard of this package. The noted restaurant at the Eiffel Tower is the Jules Verne. The narrated boat rides can be found on TripAdvisor. Different companies leave from different docks in Paris. There's one near the Eiffel Tower.
We didn't eat at the Eiffel Tower but we took a river cruise (without a meal) on Bateaux Parisiens. The commentary was okay, done in 3 languages, but we really just wanted to ride on the river. I didn't take notes so I don't even remember most of the buildings that they pointed out. If you can, go during sunset when the sky is still light enough to see everything, but the city lights are coming on. We wanted to do this but had some stupid-tourist problems and ended up taking a tour the next day in late afternoon. I still wish we had done an evening cruise.
The fast food restaurant on the second level turns into a very nice restaurant in the evenings 58 Tour Eiffel. The cuisine is from the same chef as the Jules Verne and costs considerably less. Google it. My wife and I had an unforgettable anniversary dinner there with a window table overlooking the Trocadero. But the lunch setup is strictly fast food in the same space on the second floor.