Campari and tonic is a long-time favorite, still love it, a great summer drink. frozen margaritas (or any margaritas, actually) can be dangerous, refreshing and sweetened so you don't notice the amount of tequila you're drinking until it's too late.
Campari is the only liquor I can drink anymore, just beer and wine otherwise. my stomach just can't take strong cocktails, whiskey, etc. never gave scotch a chance to acquire a taste for it. Myer's dark rum with coke isn't bad but not my thing anymore.