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Even today God has given us liberty. He has given us His moral will in the Bible. All His commands are plainly stated. There are none that we must "figure out." God is very clear about what He wants from us.
Many people are in error of making up extra commands and claiming that they are in the Bible. Jesus (and Isaiah) had strong words for people that taught rules that were not actually commands. "But in vain do they worship Me, teaching as doctrines the precepts of men." Or in other words..."teaching as truth things that they have made up."
If you want to know if something is forbidden, look it up in the scriptures. If God says it is wrong then it is. If God is silent about it, He gives us freedom to enjoy ourselves.