We had spent a week on the Swiss side of the lake and had now crossed by ferry to the French side, we were hoping to travel by train to Mont Blanc, and other areas, but found that trains were few and far between, and a hire car was out of the question, so feeling a bit unhappy about being "stranded" we mooched about, and instead of rushing here there and everywhere we were relaxing, i could imagine the people in the olden days strolling along the promenade, taking the waters, which it is very famous for, and sipping tea at one of the many cafes. there is, or was a famous hotel ( now a park ) that can be reached by the free finicular railway, this looks out over the lake.
while we were there we saw The Lac Leman Tour, there were lots of old cars all lined up near the casino, and then they all set off to thier next stop along the lake, it was good watching them splutter along past the lake, some of them having to be push started, it was like wacky races.
Near the marina are fountains, and everyday at 5pm they dance to music, this is better viewed from a distance rather than too near which we were, there is also a "little train" that takes you all round the main street, and along the prom showing points of interest, we didnt go on it, we had a small map and walked to them, which you can do quite easy.
It is a very pretty place, very relaxing, but i wouldn't return, not for a week anyway maybe a few days, because of the transport system, but if your driving i think it would be great. You can get to any place along the lake by boat which is what we did and really enjoyed it, but would have liked to get into the mountains.