nigglesworth, there are hundreds of destinations that can accommodate your needs but I have only been to some, so here is my first choice if I were you. Since it is a parent-child fishing trip, I would think the following factors are important:
1) Safety.
2) Constant fishing action, with fish size that the kids are capable to handle.
3) Other activities that both parents and children can participate when they are bored of fishing.
By keeping these in mind, I would suggest Lakeside Gardens on Salt Spring Island where we have been going back every summer. Although the fish species (mainly smallmouth bass and yellow perch, and the odd cutthroat trout) in St Mary's Lake (where the resort is located) are not signature species of BC's fishery, the fishing between May and September can be fantastic and really enjoyable for all. The smallmouth bass are generally between 1 to 3lb, the yellow perch are a couple hundred grams, the cutthroat trout can be anywhere between 1 and 4lb. The fishing is consistent, can either be done from shore (pier, beach, rocks) or boats.
There are three types of accommodations available at the resort:
1) Cottages: They are good for 4 to 6 people, four cottages are available.
2) Cabanas: They are good for 2 to 3 people, about a dozen are available.
3) Campsites: For tents and campers, about six sites are available.
The accommodation is rustic, but very comfortable, a mix of luxury and the wilderness experience.
Other activities:
The nearby ocean piers can be good for fishing as well, mainly for flounders, perch and some crabbing. Shellfishing is available, if there is an opening. There are also a couple of nearby smaller lakes for the more dedicated fishermen in the group. The island has many farms, vineyards, art galleries where you can travel to if fishing becomes boring. The Saturday artist market is good. The provincial parks are also great for hiking etc.
Website:
http://www.saltspring.com/lakesidegardens/Default.htmBecause Lakeside Gardens has been an advertiser on this website since the beginning, Mark the owner offers discounts to forum members. If you have a big group, let him know that you are a member and I'm sure he can work out a good price for you.
Other than this, I don't really have other recommendations. Most of our fishing outings are done with camping or hotels involved, we've never really done lodge-style fishing trips, so others maybe able to fill in.
Good luck.