I haven't seen this mentioned here, but a margarita is a solid, easy-to-make summer drink:
2 shots white tequila (i like espolon)
juice of half a lime
1 shot cointreau
fill shaker glass with ice, shake 25-40 times depending on how strong you want your drink. strain & serve
I love margaritas, but that's too much Cointreau for me. Best margaritas for me highlight the Tequila, so I usually go with just lime juice and splash of agave nectar (or sometimes if I'm lazy, Tommy's mixer which is just fresh lime and agave).
Limes are so acidic that the juice can keep a fairly long time in the fridge without spoiling. So I don't think you need to freeze them.
Recently we had some friends over for an impromtu party. I had this really nice bottle of reposado, but only a few limes and no sweetener. But I had some South African guava juice. Bam! Tropical margarita. Was super good.