Miami to San Francisco by plane. On foot, walked from Redwood City, CA across the Dumbarton Bridge all the way to the Fremont BART Station (about 20 miles), took the BART to Berkeley and walked around the city for about 12 hours in the span of one freakin' day. Amazing. Also took a train from Champaign, IL to DeLand, FL (about 1000 miles) and a bus from Louisville, KY to Key Largo, FL (over 1k miles). All in all been on quite a few solo adventures myself.