Adopt a half-and-half plan.
It's true that you'll never be 26 again, and today you can travel without the encumbrances that come with including family in your trips. So do it -- but on a modest scale. Shorter trips, closer destinations, think about American sites instead of international ones, fewer splurges.
On the other hand, money that you invest today has the benefit of years and years of compound interest growth. In that same sense, you'll never be 26 again; you'll never have this many years left ahead of you to allow your money to grow.
So don't sacrifice either goal for the other: Travel, but modestly, and recognize that your trips will "cost you" more years of work later. Invest carefully, understanding that your investments could've taken you on a great adventure today, but they'll take you on more tomorrow. You want two things; both are good, so let yourself have them -- what may "have to go" to allow these both, of course, is everyday lifestyle: meals out, clothes, the latest electronic gadgets, you know, the things that most people spend upon constantly.
Finally, don't worry too awfully much about the "could be hit by a bus thing". Yes, such things have happened to a few of my friends (okay, not literally -- none of my friends have actually been hit by a bus), and they've been tragic situations; but the vast majority are still here today -- and most of them wish they'd saved more when they were 26. And don't worry about whether you'll be "too old" to want to travel later -- you won't. 26 is great, but 46 is way better in dozens of ways.
Half and half, that's the answer.