How about to an EU destination ?

(The rest of this is somewhat OT. Mods, feel free to move it into a separate thread if you deem it necessary.)

We have a DGLOB34, ZRH-LHR-ORD-LGA-ORD-DFW-HNL-NAN-BNE-DRW-PER-SYD-NRT-LHR-PRG-LHR-ZRH. I'm basically trying to get some "value" out of the last few legs, within the constraints that our LHR-NRT date is basically fixed (Sunday 26 October), and I need to go back to work (in ZRH) either the Monday or Tuesday after that.

(At 33769 miles and 1340 SCs, I think I've milked the most out of it I can while still getting everywhere we want to go.)

Since we're not Europe natives and are looking to do as much holidaying around during the couple of years we're here, pretty much any "interesting" destination is OK. At the moment I have the last few legs as LHR-PRG-LHR-ZRH, over the course of Sunday-Monday-Tuesday. I'm thinking that after I've paid for and had the DGLOB34 ticketed, we'll change the dates on the last 3 legs and get a separate ticket from LHR-ZRH to "get home" on the Sunday. Then, a few weeks later have a long weekend in Prague flying ZRH-LHR-PRG-LHR-ZRH and use up the last few segments of the DGLOB34 (another option I'm considered for the last 3 segments is LHR-PRG-BUD-ZRH, but obviously I'd need to decide on that before ticketing it).

We have friends in London, so we visit there fairly regularly. The somewhat circuitous route to Prague would just give us an excuse to drop in on them overnight on the way.

If the extra taxes I'll have to pay at checking are negligible (10s of pounds), I'm OK with that. I just don't want to get a scary "that'll be a couple of hundred quid, sir" practically doubling the cost of a dirty weekend .

(Also, is there any easy place where I can lookup the various airport (not just LHR) departure taxes/fees ? Or is this something that requires significant research and hard-won experience ?)

Cheers,
CS