I went outside the Heineken Museum, but not in it mate. As for Ajax's stadium, I will probably do a tour of that on the next trip as I didn't get around to it due to already fitting a lot in. Plus I doubt they'd have had tours on Tuesday either due to a game(vs Real Madrid) the day after, as that is how it usually works.
Those travel cards which allow you to travel by any Train, Tram, Metro, bus, or even the Ferry across the river are a god send. I like to walk as much as I can there as it's a very walkable city, but sometimes you need to jump on trams, especially to get from my hotel to whereever I needed to go. They are spot on. I hated the tram last time as I went as it was on a weekend and they were busy as fuck but with it being Mon-wed this time, they were much quieter.
A tip though, make sure you get the tram going in the right direction and not just look at the number of the tram like I did . I luckily noticed, got off at the next stop and redeemed myself.