Hmmm what would I recommend eh, I guess it would have to be Kratom. Without any tolerance and in the right dose it's like a mild combo hit of an opiate's euphoria, mdma's empathy and amp's energy. The higher the dose the more opioid sedating, but a breakthrough low dose gets me moving around, feeling great, focused and connected. Plus it's legal in north america and europe.
Here's a trip report I posted last week.
http://www.bluelight.ru/vb/showthread.php?t=532283
edit: also bluelight's purpose is harm reduction so asking purely what do you recommend to get messed up could be frowned upon. Think of my advice as an answer to the question, what are some safer alternatives to meth which give me some energy and focus but have less of the long and short term health and addiction risks.