My advice would be, that if you do go for the coastal home, make sure that you get a sea view. Otherwise, you may as well be in land, imo.
What are the nearby facilities like, for the children? I moved house to a brand new location, when my kids were 3 and 5 (a work transfer). We had a choice of a coastal location, with not much going on, or a location 30 minutes in-land, with loads for the kids (swimming/bowling/cinema/shops/restaurants). We chose the in-land location, for that reason, and also because the commute to work was far more reasonable from the in-land location. But like a PP said, whenever we had a day at the coast, I always had a bit of a sinking feeling as we travelled home, away from the sea.
Fast forward 6 years and my marriage dissolved, but the kids were still needing amenities, so I moved about 2 miles away (so still in-land).
Fast forward another few years and I re-married, and my DH was from a coastal town and also working there, so he was doing the commute from my home in-land, to the coastal location. Kids were almost at Uni. I had changed jobs and worked from home. So, all of a sudden, living in the coastal location was viable. So we decided to keep an eye on the property market, and only move for a house with a view.
We eventually found one and moved to the sea-side a few years ago. Our house is right on the seafront, there is literally no other property in front of us. I love it! We sit outside with morning coffee. In the evening, we can sit out with a glass of wine, and watch the boats go by, or people kayaking. Sometimes a big cruise ship will go by, or an oil tanker. But there's no doubt, that if the kids were still at home, they would be a bit bored here. There's a small town centre, and about 4 restaurants. But that said, you can get to enormous retail parks within 10 minutes and a gigantic shopping centre in 30 minutes, so that's all fine, imo.
It's not a tourist town tho. About 10 mins away there is a very touristy town, and our home there would be worth double. We pop over for lunch sometimes and have to say, not sure I could put up with all the hussle and bustle, every single day. It's just sooo busy.