As the weather is improving from now on, try to get a family membership at the Bay Club of the Intercontinental Doha. The atmosphere there is friendly and gorgeous, they have a nice swimming pool, fully equipped fitness club including sauna and steam rooms, and also there is a very nice casual Greek restaurant at the pool. I my self go there every week and never regret being a guest at that place.
Hope this is one cool option for you and your husband to pass the time in Doha.