Three of the best dates Ive had are:
Walking round a park and then just sitting on the grass, on a sunny day.
Wandering round town, stopping for something to eat in a cafe.
A guy cooking a meal for me, then just cuddling up watching a film.
None of these sound that exciting, but it's more about the company than where you go. If there's lots of interesting conversation and you click well, it's likely both of you will have a good time.
Here's a few more ideas you could use, not dates I've been on, but places I've been with boyfriends:
To the seaside - went on a boating lake, to a sealife centre, to the arcades, on the beach, a long walk up to this amazing view where we sat for a while, and then a meal in a cafe/restaurant.
Gigs.
To a theme park.
To this activity place where we did rock climbing, kayaking, orienteering.
A walk and a picnic.
To the theatre.
To a fair.
Bowling and cinema.
Going round museums/tourist attractions.