Most Helpful Guys
Does it snow where you live? Go sledding.
Walk in the park
Art Museum, or other museum
Animal shelter then grab a bite to eat
Swimming in the river
Botanical gardens / arboretum
Maple syrup tour in the winter (some places you can "adopt" a bucket)
Watch sporting events - many are free
Photography trip to just about anywhere interesting
Walk in the rain (a good mud fight might be fun)
Sex... free fun and can last for ages altho admittedly not a date exactly. Failing that a walk through the park on a sunny day. Time spent on the beach. Grabbing an open air movie. Ice skating. A trip to a museum. A trip to a festival or an event. Why not grab a picnic hamper and spend a day in the country (see point 1) or simply go swimming.
Most Helpful Girls
If you want something that doesn't cost anything - you could try having a picnic at the park - or you guys could do yoga together - or go to each others houses and watch a work out video together lie pilates and exercise together. You could also host a bible study at your house over coffee or if your not Christian - host a Torah session or whatever religion you follow. You could also watch Netflix at your house together. Or watch a debate on youtube and then have a discussion about it.
Stay home. Cook up something. Watch a movie with popcorn/junk food. Dim the lights, put on a John Meyer track, slow dance. Make love everywhere in the house. Pillow talk. Take a bubble bath together...