Date idea?

So my bf and I have been dating for three months now but we’ve only really hung out at his house a few times. (We’re in high school btw) I want to have an actual date but both of us are pretty busy and I’m broke and don’t want him to have to pay for everything. So I thought it would be cute if we went to my grandmas house in a shed thing in the backyard we have been redoing. It’s not very big but I was thinking I could put some blankets and pillows in there and figure out how to get a movie or board game or something to do. Is this a good idea?