If you don't have a way to keep the temperature at 50 degrees or so, you might want to try option #1, but use a clean well attenuating ale yeast. If you use nottingham, and try to ferment closer to 60 degrees, you will have a lager-like beer. If you use lager yeast at 65 degrees, you may have some sulfur and off-tasting flavors.
You could try option #2- that's sort of what I do. Not for primary- I do that at 50 degrees, but for lagering. I fill an igloo ice cube cooler with some water and my carboy (I even made a styrofoam lid for the cooler, to insulate better) and a floating thermometer in the water, and use ice bottles to bring the temperature to 34 degrees for 8 weeks or so for the lagering phase. Sometimes a bigger beer will be lagered for 12 weeks.
Primary fermentation for lagers may take longer than week or two. You may want to ferment at 50 degrees for about 10 days, or until primary is about 75% complete. Then, you can raise the temperature to 60 degrees for the diacetyl rest. After 48 hours at 60 degrees, you can rack to secondary and then reduce the temperature 5 degrees per day until you're lagering at 34 degrees or so. Your time table of a week in primary, 2 in secondary will need to be adjusted.
If it was me, I'd just use some neutral ale yeast and go with #1. I think 64 degrees is a bit high but it'll work. I rarely ferment any ales above 62-64 degrees, though. I know a few ale yeast strains like it a tiny bit warmer, but I've learned that my beers are more to my taste when fermented on the cool side of the yeast's preferred temperatures.
Broken Leg Brewery
Giving beer a leg to stand on since 2006