Edit: Thanks all for the responses, guess it's more about what's important between the 2 of you. After around a decade, things are starting to feel a bit repetitive I guess so I was trying to see if I could gain some fresh ideas.
Something meaningful to your partner, not just a fancy place (those are nice too).
Close by our house is a little pho place that my wife loves. She hates the cold weather, and if it's an especially chilly day she's usually feeling "meh" but if I say "let's go get warm soup belly" her mood instantly changes and I think that's romantic :)
I'm alright just hanging out in his or her house. Going places is nice, but you shouldn't go somewhere to have a nice time just because it's a status symbol to consider that date-like. A lot of people treat outings to venues and attractions like you're recharging the batteries on your relationship, and to me that comes off as a red flag because then the dynamic isn't flowing and is more like something that consciously must be maintained.