Normally, an appreciating currency reflects a strengthening economy, relative to other countries AND ignoring interest rates. The US economy may be anemic, but it is not bad, especially compared to other countries. The dollar is simply too strong. This reduces the ability of the Fed to raise rates, as that puts more upward pressure on the dollar . But, be careful what you wish for, as the price of oil will likely increase as the dollar weakens.
Maybe, it is time to book that European vacation . . .