Sounds really fun. Zurich is a very spectator friendly course, so your family will have lots of fun tracking you that day.
I think you should spend the balance of your vacation in Switzerland. It’s a gorgeous, unique country, and having done Ironman you will be kickstarted to being a part of the fabric of the population rather than just any tourist. All Euro countries are expensive.
What do you like to do on vacation? From Zurich, you can be in any other part of Switzerland within 3 hours time. Someone suggested Lauterbrunnen (west), that is in the Bernese Oberland and contains stunning scenery most closely associated with Switzerland. On the way over, you could stop by Luzern too, and go hike around and check out William Tell country, the Rutli meadow where the apple and the arrow went down in 1291. That is the Gettysburg of Switzerland.
~Heading east (90 min), you could hit up Graubunden, home of the mtb world champion and Olympic silver rider Nino Schurter (you can book a training session with him for $$$), plus a few ski gold medalists. There is an extensive amount of bike trail network here, many places to rent a bike (that’s always a good clue) and even a network of what’s called “biker hotels”. http://www.flims.com/...ikeGuide_2013_EN.pdfThis area is near Austria and Leichtenstein if you must make a side trip to another country. There are tons of outdoor activities here, mountain lifts, hiking, ziplines and freezing cold lakes with the cleanest water you’ve ever seen. the southern part of Canton Graubunden contains the familiar towns of Davos and St Moritz…James Bond territory.
Flims and the surrounding area have made a huge effort in the past decade, to become a tourist friendly summer destination as well as just for skiing. It shows.
~3 hours South of ZH, you can drive over or through the Gotthard pass, spectacular experience (think California Route 1) , to Ticino. On the other side of the pass, they speak Italian and you can dog paddle around Lake Lugano under the palm trees. There’s some ziplines and riding around there (Monte Tamaro) but not too much. From Ticino you can go to lunch in Italy by Lake Como , rent a boat and zip past Clooney’s place.
~3 hours Southwest of ZH will bring you to cantons Vaud and Valias, Geneva, Lausanne, Olympic Museum, steepest vineyards in the world, The Swiss Riviera (vevey , montreux), Castle Chillon, stunning scenery, home of the huge Jazz Festival. Savoie alps and French border. This is Switzerland’s wine region, and they keep 99% of their wine for themselves for a reason.
Also in Canton Valais, the Matterhorn, where depending on the weather you might be able to ski in July.
Now, come on. You’ll already BE in Switzerland!! Any other time you come over, they’ll charge you 40chf to drive over the border (in a car rented elsewhere). Might as well save the 40chf and stick around and have the experience of a lifetime.
PS. Full disclosure, I’m Swiss.