Rating this place and giving it 5 stars is like shooting fish in a barrel. It's the best place in…read moreHamburg to hang, and luckily it's 10 minutes from me mum's house. I always say "I'm heading down to Strandperle", but in reality I've never hung out at Strandperle, always at Ahoi, because it's breezier, and they have a decent weizenbier on tap. I've been there in January, when it's just barely above freezing, and all the outdoor tables are full (Hamburgians's love to soak up rays on sunny days; though if it's over 80 degrees, it tends to be less crowded because they find the heat a bit intolerable).
The pizza is pretty good, but I usually just get the tap weissbier. Getting a table outside in the shade can require some eagle-eyed patience, but you can pretty much always find a place in the sun, or take your drink 25 feet and sit on the sand.
Far and away the best way to get there, if you mum doesn't live just up the hill, is to take the ferry boat (#61 or #62), from Landungsbrucken or the Fischmarkt to Neumühlen/Övelgönne then walk west along the river. It's part of the public transportation system, so you can travel on the ferry with your day pass, or you can buy a ticket in the boat from a machine. If you're up for a swim, there is a public indoor/outdoor swimming pool which is an 8-minute walk from the end stop on the ferry line, Finkenwerder. (You can also actually swim in the river, off to the left from Ahoi/Strandperle, but the water is kinda brown.) Then, after a swim, Ahoi/Strandperle is the perfect spot for some après -swim suds.