What is he getting me?

My boyfriend and I's 6 month in this firday and I'm trying to get an idea of what he may be getting me. He keeps saying stuff like, "you're gonna love it", and "I think its the best thing i've ever gotten anybody". but i have no clue what it could be. He said said he ordered it online & that we need to be outside for it........ I'm so confused.......any ideas for a nosey girlfriend? lol