A very simple but popular mixed drink on hot summer days is a mixture of equal parts beer and lemonade. It's called a Radler. It also only has about 2.5 % alcohol.
Quite common in the UK too and known as a Shandy.
Bit like Phil .... Dark Rum and Coke (a nice Estate Rum preferably) ... as the evening goes on the Rum gets bigger and the Coke gets smaller 🙂
Have you tried a Dark & Stormy? Two parts dark spiced rum to five parts Ginger Beer - a squeeze of a quarter of a lime? Worth a shot if you haven't and like the sound of it. I've dabbled with various rums for the mix and have settled on Kraken being one of the better ones and Bundaberg Ginger Beer being a good match.
A nice glass of good Amarone, with some good cheese, is a great winter shout as well.