If you want to fly 3-4 adults and any luggage at all, you'll probably want a C182 or Cherokee 235. Both are going to burn 11-13 gal/hr depending on how fast you want to go.
Not a lot of people like spending 5 hrs at a time in a small, noisy airplane. 2-3 hr legs are much more pleasant. Four hours was about my absolute max endurance, and that was when I was 30 years younger.
And since you're still learning to fly, I'll tell you it's also a lot more pleasant having two hrs fuel on board when you arrive than 30 minutes. Stuff happens, headwinds appear and tailwinds disappear, detours become necessary. Have personally seen several aircraft wrecked that ran out of fuel five to ten miles short of destination. I once HAD to go 5 hrs in an airplane that fortunately carried fuel for 6 because of weather. I never let that happen again.