Looking for someone to marry should be about looking for a partner for life. So find someone who wants a similarly active lifestyle. I know plenty of couples, who, even after multiple kids, go out, traipse about the city, etc etc. They are very active because they want to be. Other couples are comfortable in a quieter lifestyle. As long as each partner is content, it's fine. You can make your marriage what you want it to be, but you need to be willing to talk openly to your partner and to respect and show understanding toward her/his desires.
Agreed with post above. Be very careful in the type of partner you choose & be open about your likes/dislikes. Hopefully you will find a partner who has similar interests as you and you guys can enjoy the lifestyle you like. Also even if your spouse doesn't want to do an activity, sometimes you can still go out alone with friends etc whatever. Other times she can go out with her girlfriends and do her own thing as well. You have to balance you wants, with responisbility etc. It does become harder after having kids but many do it. My cousin was similar to you before marriage....his wife had done no travelling nothing....but together they explored so many places, esp as he travelled a lot for work. They had twins, but they still go overseas to travel, just a different kind of tavel with 2 babies then & now 4. They just visited Turkey & had an amazing time. I think with time, your likes/priorities etc change. Like the example PSquared gave, some people work such horrid hours (esp docs in residency) that when they do have free time, they really do want to simply spend it with spouse/kids more than anything.