take a walk along the city or somewhere scenic and grab some ice cream along the way. if there's any kind of easter-related festivals going on that day you can stop by those along the way and play some games
do NOT go to movie theater (or the "cinemas" as you non-US folks call it)
A great philosophy I think is to do things DIFFERENT than what allll the other losers out there are doing. They are going to see a movie or going to the same restaurant that all the other guys are. BOOOORING
Go do something in the outdoors, hopefully it's decently warm where you live? Do something that you/her wouldn't otherwise be doing often. Google a nice hike or rent paddle boards or whatever is going on in your area. Outdoors are great because you can talk a lot and get to know each other and prove you're fun.