I was so wrapped up in my kids that when we'd have a datenight (once in a blue moon) I couldn't think of a thing to do! So I started my 'Date Bible'.
In this binder I sectioned it out by local cities, and in each city I put all the local attractions and then a list of the restaurants and parks (and beaches). I happened to live in CA where there was alot of things to do, so I also kept on hand a tour guide, and a book called : "The Best Places to Kiss in Northern California".
Here are some ideas: Bowling(place kissing bets on who will win) , test driving a car at a local lot, rent a boat on the lake(take a picnic), walk across a bridge, visit local rose gardens, farners market, cathederals, museums, take cooking school classes, (or just cook something fun together...like try your hand at tossing pizza-there are tutorials an utube,..meanwhile play the Italian opera music CD "AMORE" to get in the mood), lookup all the local festivals online and try to plan a date around one,if there are local farms, go there and pick fruit, stroll around a garden nursury, visit the library, go get an ice cream and visit shops downtown,some restaurants have sunday morning brunch, go fishing and tell him all the things you adore about him , some cities have walking tours, go on a train, in spring, visit areas with wildflowers-wear a beautiful white dress and have him take photos of you, bike ride to your nearest park (take a bottle of cold sparkling cider, wrap some slices of cheese and pack it into the middle of 2 paper cups, roll this up in a small throw and bungee it to the bike - to enjoy when you arrive), mini golf, visit the bookstore and have coffee in the cafe there, grab a magazine you can look through together that you are both interested in. If you have a natural area close, take a field guide with you, some binoculars, and enjoy. Sometimes at night, after the kids were bedded down, my husband and I would go out in the backyard and skywatch (you can find the costellation maps online), talk, and enjoy a virgin drink,(take the baby monitor with you)....
You can find events around your area by visiting your local chamber of commerce and doing 'community event' searches for your town on google.
Doing something different can spark excitement. Having fun together can keep your relationship exciting for him. We have to remember that we women have a strong mother instinct and tend to lavish all our attention on our kids, leaving nothing left for the husband. Good for you for keeping date nights alive.