I live the time I spend just hanging around the house with my boyfriend but I don't want him to get bored! what are some fun but cheap dates? We both like athletic or adventurous and creative types of dates

I've thought of :

SUP paddle boarding

Hikes

Renting a double bike and going down the beach trail

And that's it! We live right by the beach and there's nothingggg around this town! Any ideas???