I agree that it gets hard with a school schedule. And if they do camp or sports you're working around those schedules too.
I love travel and I love traditions, but don't box yourself in to thinking you have to do camping or a national park or whatever. Especially as the kids grow and you know their personalities and interests, you'll work with that. Sports halls of fame, amusement parks, whale watching, cities known for music.... If we said we must do beach vacations in December, we'd miss all those other types of trips.
Finances and schedules and interests ebb and flow. We try to do one "big" trip a year, but some years we've done 3 and some years we've done none, for various reasons.