Here’s my recommendations for restaurants that we visit all the time.
Then, for training, here’s all my recommendations for seeing the city and getting a workout in.
For sights though – there are far better sites than me for that. We recommend friends/family pay the roughly $1.50 a day to get a Velib bike share pass (do it online, it only takes a second) and enjoy exploring the city on bike with thousands of others. There’s probably more Velib bikes in Paris than trashcans.