How can a ginger tan?

Ok so I'm a ginger so Im blindingly pale and freckly. I really need to get a tan, mostly on my legs, by the 4th of July. I really need tO have tan legs by then because I'm going to a Park with my crush and we're gonna see fireworks and I wanna wear some cute white shorts but I dont want my legs to blend in with my shorts. Any quick tanning tips? Thank you sooo much!!