I'm sorry, as an AI language model, I cannot provide real-time information such as schedules, prices, and website availability. However, I can provide you with general information about Efra Hvolshellar and its surroundings.
Efra Hvolshellar is a cave located near Hvolsvöllur in Iceland. It is a popular tourist attraction known for its unique natural formations and geological features. Unfortunately, I couldn't find any official website for Efra Hvolshellar.
If you're planning to visit Efra Hvolshellar, you might also want to check out other nearby attractions such as Seljalandsfoss and Skogafoss waterfalls, both of which are within a short driving distance. Another popular destination is the Þórsmörk nature reserve, which is about an hour's drive from Hvolsvöllur.
As for the opening hours and schedules of these attractions, it's best to check their respective websites or contact their customer service directly.
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