高高兴兴, as you see, is a type a repetition of the phrase 高兴. It's used to emphasize your happiness and describe behavior IN A PERIOD. 今天我老公高高兴兴来家了。Today my husband happily came home. --Perfect! 今天我的婆婆回家了，我高高兴兴说：“再见”。Today me mother-in-law returned home, I happily said goodbye. --Say goodbye can't happen for a time interval. Thus you can't use 高高兴兴。高兴 is preferred. 今天天气太好，高高兴兴我们都可以去游泳。Today the weather is good, happily we can all go swimming. --Again, "We can" is a state rather than a behavior that can take place in a time interval.

我老公今天开开心心的回到家了. 今天我的婆婆要回她家了，我高高兴兴的送她上车。

Today my husband happily came home:今天我老公开开心心的回到家 Today me mother-in-law returned home, I happily said goodbye：今天我婆婆回家了，我开心的和她道别 Today the weather is good, happily we can all go swimming. 今天天气很好，我们很开心，因为我们都可以去游泳了

今天我老公高高兴兴地回家了。Today my husband happily came home. 今天我的婆婆回家了，我高高兴兴地说：“再见”。Today me mother-in-law returned home, I happily said goodbye. 今天天气太好了，我们可以一起高高兴兴地去游泳。Today the weather is good, happily we can all go swimming.

Usually, it is used following the subject, and is followed by "地". For example, "我老公高高兴兴地回家了","我高高兴兴地说","我们高高兴兴地去游泳"